Method of making a unified interior and exterior design verification model

A method of making an interior and exterior design verification model comprising:

• developing a mathematical model of an interior surface and an exterior surface of a proposed design;
• defining a series of boundaries of separable parts of said design;
• defining at least one bench mark plane within a space bounded by an interior surface and exterior surface of a first part of said design, said first part having an interior portion and an exterior portion associated therewith, the interior surface and exterior surface of said first part corresponding to the interior and exterior surfaces of said proposed design, respectively, when the interior and exterior portions of the first part are joined together;
• assembling the interior and exterior portions to each other thereby aligning the portions and thereby forming an assembly;
• checking the assembly;
• separating the interior and exterior portions from each other at said bench mark plane then;
• shaping said exterior surface on the exterior portion of said first part of said design according to the mathematical model independently from the interior portion;
• shaping said interior surface on the interior portion of said first part of said design according to the mathematical model independently from the exterior portion;
• and
• re-assembling said interior portion and said exterior portion together at said bench mark plane.