Plastic panel and structures using the same

A hollow plastic wall panel, the panel having a length greater than a width, a thickness less than the width, a front wall, an opposite back wall and opposed first and second long edge regions, wherein the panel comprises a first end and a longitudinally opposite second end, wherein the first long edge region defines at least one first recessed portion to longitudinally receive and mate with a first longitudinal support beam and wherein the second long edge region defines at least one second recessed portion to longitudinally receive and mate with a second longitudinal support beam, wherein the at least one first recessed portion is arranged, in use, to partially surround the first longitudinal support beam and the at least one second recessed portion is arranged, in use, to partially surround the second longitudinal support beam, whereby the panel can be held in place by the first and second longitudinal support beams, wherein the first end has at least one end recessed portion arranged, in use, to accommodate a coupling structure disposed about or adjacent to one or both of the first and second longitudinal support beams, wherein the at least one end recessed portion comprises first opposed end recessed portions formed in the back wall at or adjacent respective top and bottom edges of the first end;

• and wherein the length of the panel is between about 2 m and about 4 m.