Molding components, including plinths and corner pieces, kits, and systems comprising the same, methods of making them and methods of assembling them

A kit comprising:

• a first corner piece;
• a first molding piece;
• and
• a first plinth structure,
• wherein:
• the first corner piece comprises a first corner piece structure having at least a first corner piece structure front side, a first corner piece structure rear side, a first corner piece structure first edge, a first corner piece structure second edge, a first corner piece structure third edge and a first corner piece structure fourth edge,
• the first corner piece structure rear side comprises a plurality of first corner piece raised surfaces and at least a first corner piece first recessed surface,
• the first corner piece raised surfaces are each substantially flat and are each substantially co-planar with a first imaginary plane,
• the at least a first corner piece first recessed surface is recessed from the first imaginary plane,
• the at least a first corner piece first recessed surface comprises a plurality of first corner piece protrusions and a plurality of first corner piece valleys, each of the first corner piece valleys recessed relative to at least one of the first corner piece protrusions, each of the first corner piece protrusions comprising a respective extremity of the first corner piece protrusions, each of the first corner piece valleys comprising a respective extremity of the first corner piece valley,
• each of the at least a first corner piece first recessed surface is configured such that:
• (1) with the first corner piece structure in a first corner piece first position, a first molding piece comprising a plurality of first molding piece protrusions and a plurality of first molding piece valleys, each of the first molding piece protrusions comprising a respective extremity of the first molding piece protrusion, each of the first molding piece protrusions aligned in a first direction, each of the first molding piece valleys comprising a respective extremity of the first molding piece valley, each of the first molding piece valleys aligned in the first direction, the first direction substantially parallel to the first imaginary plane, is capable of being positioned in a first molding piece first position relative to the first corner piece structure such that:
• (a) every cross-section of the first molding piece defined along imaginary planes that are each parallel to the first corner piece structure first edge is of substantially a same first molding piece cross-sectional shape;
• (b) in the molding piece first position, a back side of the first molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the first molding piece protrusions are farther from the first imaginary plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the first molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• (c) from the first molding piece first position, the first molding piece is capable of being freely slid, relative to the first corner piece structure, in a direction perpendicular to the first corner piece structure first edge, such that at least some regions of the first molding piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the first molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement, and
• (2) with the first corner piece in the first corner piece first position, a header piece comprising a plurality of header piece protrusions and a plurality of header piece valleys, each of the header piece protrusions comprising a respective extremity of the header piece protrusion, each of the header piece protrusion aligned in a second direction, each of the header piece valleys comprising a respective extremity of the header piece valley, each of the header piece valleys aligned in the second direction, the second direction substantially parallel to the first imaginary plane and substantially perpendicular to the first direction, is capable of being positioned in a header piece first position relative to the first corner piece structure such that:
• (a) every cross-section of the header piece defined along imaginary planes that are each parallel to the first corner piece structure second edge is of substantially a same header piece cross-sectional shape;
• (b) in the header piece first position, a back side of the header piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the header piece protrusions are farther from the imaginary first plane than the extremities of at least some of the corner piece protrusions are, and at least some of the extremities of the header piece valleys are closer to the first imaginary plane than the extremities of at least some of the corner piece valleys are;
• and
• (c) from the header piece first position, the header piece is capable of being freely slid, relative to the first corner piece structure, in a direction perpendicular to the first corner piece structure second edge, such that at least some regions of the header piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the header piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement,
• the first molding piece comprises a plurality of first molding piece protrusions aligned in a first direction and a plurality of first molding piece valleys aligned in the first direction, the first direction substantially parallel to the first imaginary plane, each of the first molding piece protrusions comprising a respective extremity of the first piece protrusion, each of the first piece valleys comprising a respective extremity of the first molding piece valley,
• the first corner piece is configured such that with the first corner piece in a first corner piece first position, the first molding piece is capable of being positioned in a first molding piece first position relative to the first corner piece structure such that:
• (a) the first molding piece protrusions are aligned in the first direction and the first molding piece valleys are aligned in the first direction,
• (b) every cross-section of the first molding piece defined along imaginary planes that are each parallel to the corner piece structure first edge is of substantially a same first molding piece cross-sectional shape;
• (c) in the first molding piece first position, a back side of the first molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the first molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the first molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• and
• (d) from the first molding piece first position, the first molding piece is capable of being freely slid, relative to the first corner piece, in a direction perpendicular to the first corner piece structure first edge, such that at least some regions of the first molding piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the first molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement,
• the first plinth structure has at least a first plinth structure front side, a first plinth structure rear side, a first plinth structure first edge, a first plinth structure second edge, a first plinth structure third edge and a first plinth structure fourth edge,
• the first plinth structure rear side comprises at least one first plinth raised surface and at least a first plinth first recessed surface,
• each of the at least one first plinth raised surfaces is substantially flat,
• the at least a first plinth first recessed surface is recessed from the first imaginary plane,
• the at least a first plinth first recessed surface comprises a plurality of first plinth protrusions and a plurality of first plinth valleys, each first plinth valley recessed relative to at least one of the first plinth protrusions, each of the first plinth protrusions comprising a respective extremity of the first plinth protrusion, each of the first plinth valleys comprising a respective extremity of the first plinth valley,
• the first plinth structure is configured such that with the first molding piece in the first molding piece first position, the first plinth structure can be positioned in a first plinth first position such that:
• the first plinth structure first edge is substantially parallel to the first corner piece structure first edge,
• each of the at least one first plinth raised surface is substantially co-planar with the first imaginary plane,
• the extremities of at least some of the first molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first plinth protrusions are, and
• the extremities of at least some of the first molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first plinth valleys are, and
• with the first plinth structure in the first plinth first position and the first molding piece in the first molding piece first position, the first molding piece is capable of being freely slid from the first molding piece first position, in a direction perpendicular to the first plinth structure first edge, such that at least some regions of the first molding piece protrusions pass at least some regions of the first plinth structure, with the back side of the first molding piece remaining substantially co-planar with the first imaginary plane during such sliding movement.

A kit comprising:

• a first corner piece;
• and
• a first plinth structure,
• wherein:
• the first corner piece comprises a first corner piece structure having at least a first corner piece structure front side, a first corner piece structure rear side, a first corner piece structure first edge, a first corner piece structure second edge, a first corner piece structure third edge and a first corner piece structure fourth edge,
• the first corner piece structure rear side comprises a plurality of first corner piece raised surfaces and at least a first corner piece first recessed surface,
• the first corner piece raised surfaces are each substantially flat and are each substantially co-planar with a first imaginary plane,
• the at least a first corner piece first recessed surface is recessed from the first imaginary plane,
• the at least a first corner piece first recessed surface comprises a plurality of first corner piece protrusions and a plurality of first corner piece valleys, each of the first corner piece valleys recessed relative to at least one of the first corner piece protrusions, each of the first corner piece protrusions comprising a respective extremity of the first corner piece protrusions, each of the first corner piece valleys comprising a respective extremity of the first corner piece valley,
• each of the at least a first corner piece first recessed surface is configured such that:
• (1) with the first corner piece structure in a first corner piece first position, a molding piece comprising a plurality of molding piece protrusions and a plurality of molding piece valleys, each of the molding piece protrusions comprising a respective extremity of the molding piece protrusion, each of the molding piece protrusions aligned in a first direction, each of the molding piece valleys comprising a respective extremity of the molding piece valley, each of the molding piece valleys aligned in the first direction, the first direction substantially parallel to the first imaginary plane, is capable of being positioned in a molding piece first position relative to the first corner piece structure such that:
• (a) every cross-section of the molding piece defined along imaginary planes that are each parallel to the first corner piece structure first edge is of substantially a same molding piece cross-sectional shape;
• (b) in the molding piece first position, a back side of the molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the molding piece protrusions are farther from the first imaginary plane than the extremities of at least some of the corner piece protrusions are, and at least some of the extremities of the molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• (c) from the molding piece first position, the molding piece is capable of being freely slid, relative to the corner piece structure, in a direction perpendicular to the first corner piece structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement, and
• (2) with the first corner piece in the first corner piece first position, a header piece comprising a plurality of header piece protrusions and a plurality of header piece valleys, each of the header piece protrusions comprising a respective extremity of the header piece protrusion, each of the header piece protrusion aligned in a second direction, each of the header piece valleys comprising a respective extremity of the header piece valley, each of the header piece valleys aligned in the second direction, the second direction substantially parallel to the first imaginary plane and substantially perpendicular to the first direction, is capable of being positioned in a header piece first position relative to the first corner piece structure such that:
• (a) every cross-section of the header piece defined along imaginary planes that are each parallel to the first corner piece structure second edge is of substantially a same header piece cross-sectional shape;
• (b) in the header piece first position, a back side of the header piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the header piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the header piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• and
• (c) from the header piece first position, the header piece is capable of being freely slid, relative to the first corner piece structure, in a direction perpendicular to the first corner piece structure second edge, such that at least some regions of the header piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the header piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement,
• the first plinth structure has at least a first plinth structure front side, a first plinth structure rear side, a first plinth structure first edge, a first plinth structure second edge, a first plinth structure third edge and a first plinth structure fourth edge,
• the first plinth structure rear side comprises at least one first plinth raised surface and at least a first plinth first recessed surface,
• each of the at least one first plinth raised surface is substantially flat,
• the at least a first plinth first recessed surface is recessed from the at least one first plinth raised surface,
• the at least a first plinth first recessed surface comprises a plurality of first plinth protrusions and a plurality of first plinth valleys, each of the first plinth valleys recessed relative to at least one of the first plinth protrusions, each of the first plinth protrusions comprising a respective extremity of the first plinth protrusion, each of the first plinth valleys comprising a respective extremity of the first plinth valley,
• the first corner piece and the first plinth structure are configured such that they and a molding piece that comprises a plurality of aligned molding piece protrusions and a plurality of aligned molding piece valleys, each of the molding piece protrusions comprising a respective extremity of the molding piece protrusion, each of the molding piece valleys comprising a respective extremity of the molding piece valley, can be positioned relative to each other, such that:
• (a) the molding piece protrusions and the molding piece valleys are aligned in the first direction,
• (b) every cross-section of the molding piece defined along imaginary planes that are each parallel to the first corner piece structure first edge is of substantially a same molding piece cross-sectional shape,
• (c) a back side of the molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are,
• (d) the molding piece is capable of being freely slid, relative to the first corner piece, in a direction perpendicular to the first corner piece structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement,
• (e) the first plinth structure first edge is substantially parallel to the first corner piece structure first edge,
• (f) each of the at least one first plinth raised surfaces is substantially co-planar with the first imaginary plane,
• (g) the extremities of at least some of the molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first plinth protrusions are,
• (h) the extremities of at least some of the molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first plinth valleys are, and
• (i) the molding piece is capable of being freely slid from the molding piece first position, in a direction perpendicular to the first plinth structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the first plinth structure, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during such sliding movement.

A kit comprising:

• a first corner piece;
• and
• a first plinth structure,
• wherein:
• the first corner piece comprises a first corner piece structure having at least a first corner piece structure front side, a first corner piece structure rear side, a first corner piece structure first edge, a first corner piece structure second edge, a first corner piece structure third edge and a first corner piece structure fourth edge,
• the first corner piece structure rear side comprises a plurality of first corner piece raised surfaces and at least a first corner piece first recessed surface,
• the first corner piece raised surfaces are each substantially flat and are each substantially co-planar with a first imaginary plane,
• the at least a first corner piece first recessed surface is recessed from the first imaginary plane,
• the at least a first corner piece first recessed surface comprises a plurality of first corner piece protrusions and a plurality of first corner piece valleys, each of the first corner piece valleys recessed relative to at least one of the first corner piece protrusions, each of the first corner piece protrusions comprising a respective extremity of the first corner piece protrusions, each of the first corner piece valleys comprising a respective extremity of the first corner piece valley,
• each of the at least a first corner piece first recessed surface is configured such that:
• (1) with the first corner piece structure in a first corner piece first position, a first molding piece comprising a plurality of first molding piece protrusions and a plurality of first molding piece valleys, each of the first molding piece protrusions comprising a respective extremity of the first molding piece protrusion, each of the first molding piece protrusions aligned in a first direction, each of the first molding piece valleys comprising a respective extremity of the first molding piece valley, each of the first molding piece valleys aligned in the first direction, the first direction substantially parallel to the first imaginary plane, is capable of being positioned in a first molding piece first position relative to the first corner piece structure such that:
• (a) every cross-section of the first molding piece defined along imaginary planes that are each parallel to the first corner piece structure first edge is of substantially a same first molding piece cross-sectional shape;
• (b) in the first molding piece first position, a back side of the first molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the first molding piece protrusions are farther from the first imaginary plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the first molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• (c) from the first molding piece first position, the first molding piece is capable of being freely slid, relative to the first corner piece structure, in a direction perpendicular to the first corner piece structure first edge, such that at least some regions of the first molding piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the first molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement, and
• (2) with the first corner piece in the first corner piece first position, a header piece comprising a plurality of header piece protrusions and a plurality of header piece valleys, each of the header piece protrusions comprising a respective extremity of the header piece protrusion, each of the header piece protrusion aligned in a second direction, each of the header piece valleys comprising a respective extremity of the header piece valley, each of the header piece valleys aligned in the second direction, the second direction substantially parallel to the first imaginary plane and substantially perpendicular to the first direction, is capable of being positioned in a header piece first position relative to the first corner piece structure such that:
• (a) every cross-section of the header piece defined along imaginary planes that are each parallel to the first corner piece structure second edge is of substantially a same header piece cross-sectional shape;
• (b) in the header piece first position, a back side of the header piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the header piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the header piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• and
• (c) from the header piece first position, the header piece is capable of being freely slid, relative to the first corner piece structure, in a direction perpendicular to the first corner piece structure second edge, such that at least some regions of the header piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the header piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement,
• the first molding piece comprises a plurality of first molding piece protrusions and a plurality of first molding piece valleys,
• the first corner piece is configured such that with the first corner piece in the first corner piece first position, the first molding piece is capable of being positioned in a first molding position relative to the first corner piece structure such that:
• (a) the first molding piece protrusions are aligned in the first direction and the first molding piece valleys are aligned in the first direction;
• (b) every cross-section of the first molding piece defined along imaginary planes that are each parallel to the first corner piece structure first edge is of substantially a same first molding piece cross-sectional shape;
• (c) in the first molding piece first position, a back side of the first molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the first molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the first corner piece protrusions are, and at least some of the extremities of the first molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the first corner piece valleys are;
• and
• (d) from the first molding piece first position, the first molding piece is capable of being freely slid, relative to the first corner piece structure, in a direction perpendicular to the first corner piece structure first edge, such that at least some regions of the first molding piece protrusions pass at least some regions of the first corner piece protrusions, with the back side of the first molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement.

A kit comprising:

• a plinth;
• and
• a molding piece,
• wherein:
• the plinth comprises a plinth structure having at least a plinth structure front side, a plinth structure rear side, a plinth structure first edge, a plinth structure second edge, a plinth structure third edge and a plinth structure fourth edge,
• the plinth structure rear side comprises at least one plinth raised surfaces and at least a first plinth recessed surface,
• each of the at least one plinth raised surface is substantially flat and is substantially in a first imaginary plane,
• the at least a first plinth recessed surface is recessed from the first imaginary plane,
• the at least a first plinth recessed surface comprises a plurality of plinth protrusions and a plurality of plinth valleys, each of the plinth protrusions comprising a respective extremity of the plinth protrusion, each of the plinth valleys comprising a respective extremity of the plinth valley, each plinth of the valleys recessed relative to at least one of the plinth protrusions,
• the first plinth recessed surface configured such that with the plinth structure in a plinth first position, a molding piece comprising a plurality of molding piece protrusions aligned in a first direction and a plurality of molding piece valleys aligned in the first direction, each of the molding piece protrusions comprising a respective extremity of the molding piece protrusion, each of the molding piece valleys comprising a respective extremity of the molding piece valley, the first direction substantially parallel to the first imaginary plane, is capable of being positioned in a molding piece first position relative to the plinth structure such that:
• (a) every cross-section of the molding piece defined along imaginary planes that are each parallel to the plinth structure first edge is of substantially a same molding piece cross-sectional shape;
• (b) in the molding piece first position, a back side of the molding piece is substantially co-planar with the first imaginary plane, and extremities of at least some of the molding piece protrusions are farther from the imaginary first plane than extremities of at least some of the plinth protrusions are, and the extremities of at least some of the molding piece valleys are closer to the first imaginary plane than extremities of at least some adjacent of the plinth valleys are;
• and
• (c) from the molding piece first position, the molding piece is capable of being freely slid, relative to the plinth structure, in a direction perpendicular to the plinth structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the plinth protrusions, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement,
• the molding piece comprises a plurality of molding piece protrusions aligned in a first direction and a plurality of molding piece valleys aligned in the first direction, each of the molding piece protrusions comprising a respective extremity of the molding piece protrusion, each of the molding piece valleys comprising a respective extremity of the molding piece valley, the first direction substantially parallel to the first imaginary plane,
• with the plinth structure in a first plinth position, the molding piece is capable of being positioned in a molding piece first position relative to the plinth structure such that:
• (a) every cross-section of the molding piece defined along imaginary planes that are each parallel to the plinth structure first edge is of substantially a same molding piece cross-sectional shape;
• (b) in the molding piece first position, a back side of the molding piece is substantially co-planar with the first imaginary plane, and the extremities of at least some of the molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the plinth protrusions are, and the extremities of at least some of the molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the plinth valleys are;
• and
• (c) from the molding piece first position, the molding piece is capable of being freely slid, relative to the plinth structure, in a direction perpendicular to the plinth structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the plinth protrusions, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement.

A corner piece, comprising:

• a corner piece structure having at least a corner piece structure front side, a corner piece structure rear side, a corner piece structure first edge, a corner piece structure second edge, a corner piece structure third edge and a corner piece structure fourth edge,
• the corner piece structure rear side comprising a plurality of corner piece raised surfaces and at least a first corner piece recessed surface,
• the corner piece raised surfaces are each substantially flat and are each substantially co-planar with a first imaginary plane,
• the at least a first corner piece recessed surface is recessed from the first imaginary plane,
• the at least a first corner piece recessed surface comprising a plurality of corner piece protrusions and a plurality of corner piece valleys, each of the corner piece valleys recessed relative to at least one of the corner piece, protrusions, each of the corner piece protrusions comprising a respective extremity of the corner piece protrusion, each of the corner piece valleys comprising a respective extremity of the corner piece valley,
• each of the at least a first corner piece recessed surface configured such that:
• (1) with the corner piece structure in a corner piece first position, a molding piece comprising a plurality of molding piece protrusions and a plurality of molding piece valleys, each of the molding piece protrusions comprising a respective extremity of the molding piece protrusion, each of the molding piece protrusions aligned in a first direction, each of the molding piece valleys comprising a respective extremity of the molding piece valley, each of the molding piece valleys aligned in the first direction, the first direction substantially parallel to the first imaginary plane, is capable of being positioned in a molding piece first position relative to the corner piece structure such that:
• (a) every cross-section of the molding piece defined along imaginary planes that are each parallel to the corner piece structure first edge is of substantially a same molding piece cross-sectional shape;
• (b) in the molding piece first position, a back side of the molding piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the molding piece protrusions are farther from the first imaginary plane than the extremities of at least some of the corner piece protrusions are, and at least some of the extremities of the molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the corner piece valleys are;
• (c) from the molding piece first position, the molding piece is capable of being freely slid, relative to the corner piece structure, in a direction perpendicular to the corner piece structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the corner piece protrusions, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement, and
• (2) with the corner piece in the corner piece first position, a header piece comprising a plurality of header piece protrusions and a plurality of header piece valleys, each of the header piece protrusions comprising a respective extremity of the header piece protrusion, each of the header piece protrusion aligned in a second direction, each of the header piece valleys comprising a respective extremity of the header piece valley, each of the header piece valleys aligned in the second direction, the second direction substantially parallel to the first imaginary plane and substantially perpendicular to the first direction, is capable of being positioned in a header piece first position relative to the corner piece structure such that:
• (a) every cross-section of the header piece defined along imaginary planes that are each parallel to the corner piece structure second edge is of substantially a same header piece cross-sectional shape;
• (b) in the header piece first position, a back side of the header piece is substantially co-planar with the first imaginary plane, and at least some of the extremities of the header piece protrusions are farther from the imaginary first plane than the extremities of at least some of the corner piece protrusions are, and at least some of the extremities of the header piece valleys are closer to the first imaginary plane than the extremities of at least some of the corner piece valleys are;
• and
• (c) from the header piece first position, the header piece is capable of being freely slid, relative to the corner piece structure, in a direction perpendicular to the corner piece structure second edge, such that at least some regions of the header piece protrusions pass at least some regions of the corner piece protrusions, with the back side of the header piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement.

A plinth, comprising:

• a plinth structure having at least a plinth structure front side, a plinth structure rear side, a plinth structure first edge, a plinth structure second edge, a plinth structure third edge and a plinth structure fourth edge,
• the plinth structure rear side comprising at least one plinth raised surface and at least a first plinth recessed surface,
• each of the at least one plinth raised surface is substantially flat and is substantially in a first imaginary plane,
• the at least a first plinth recessed surface is recessed from the first imaginary plane,
• the at least a first plinth recessed surface comprising a plurality of plinth protrusions and a plurality of plinth valleys, each of the plinth protrusions comprising a respective extremity of the plinth protrusions, each of the plinth valleys comprising a respective extremity of the plinth valley, each of the plinth valleys recessed relative to at least one of the plinth protrusions,
• the first plinth recessed surface configured such that with the plinth structure in a plinth first position, a molding piece comprising a plurality of molding piece protrusions aligned in a first direction and a plurality of molding piece valleys aligned in the first direction, each of the molding piece protrusions comprising a respective extremity of the molding piece protrusion, each of the molding piece valleys comprising a respective extremity of the molding piece valley, the first direction substantially parallel to the first imaginary plane, is capable of being positioned in a molding piece first position relative to the plinth structure such that:
• (a) every cross-section of the molding piece defined along imaginary planes that are each parallel to the plinth structure first edge is of substantially a same molding piece cross-sectional shape;
• (b) in the molding piece first position, a back side of the molding piece is substantially co-planar with the first imaginary plane, and the extremities of at least some of the molding piece protrusions are farther from the imaginary first plane than the extremities of at least some of the plinth protrusions are, and the extremities of at least some of the molding piece valleys are closer to the first imaginary plane than the extremities of at least some of the plinth valleys are;
• and
• (c) from the molding piece first position, the molding piece is capable of being freely slid, relative to the plinth structure, in a direction perpendicular to the plinth structure first edge, such that at least some regions of the molding piece protrusions pass at least some regions of the plinth protrusions, with the back side of the molding piece remaining substantially co-planar with the first imaginary plane during an entirety of such sliding movement.