Abstract: A generally box-shaped wall panel construction includes a first pair of spaced and generally parallel side frame members each of which is of a generally channel or open shaped cross section with the open end facing in the first direction. Another pair of spaced and generally parallel side frame members form part of the construction and each is preferably of a box shaped cross section. The four side frame members constitute what might be referred to as generally a box shape when they are connected by first and second plates at the end of each side frame member. Specifically, the plates have four corners with the material of each corner being formed in the first and second tabs which facilitate spot welding of the ends of the side frame members to the plate with which it is associated. Another feature of the invention is the modification of tile plates so as to enable the wall panel construction to form a 90.degree.