BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective, exploded view of the wall system embodying the invention, showing the system in partially assembled condition; FIG. 2 is a perspective, exploded view of the ceiling channel and floor leveler assembly used in the system shown in FIG. 1; FIG. 3 is a fragmentary, perspective view of the floor leveler assembly of FIG. 2, taken in the region of