The lower back chest of drawer support is too wide and does not meet flush with the sides as shown in photos and your diagram. The oversized part does not allow for the back board to sit flush with the back of the cupboard. I have purchased 2 sets of drawers so hopefully when I build the next one I dont find the same problem, as both will be inaccurate. This Is saw to the eye and spoils the look. This is a manufacturing defect.