A method of assembling a refrigerator cabinet assembly including creating a shell by bending a single sheet of material to form side walls interconnected by a top wall, forming front face portions by in-turning front edge portions of the side and top walls, creating a flange assembly including at least a front flange which leads to a return flange that extends to a rear flange, and inserting first and second reinforcing members behind the rear flange so as to be arranged at spaced locations against the rear flange and one of the side walls. The reinforcing members function to increase the structural integrity of the shell while including tab structure for mounting and/or shell deformation preventing purposes.