Notice the difference between each of this projects face frame members. Each and every face frame member may be a different width. Notice the farthest to the right stile in the upper Wall units. The stile is so wide it has left no room for an opening. Then the next stile to its left is the full height cabinets right stile which is 1" wide. The adjacent stile on the full height cabinet is 5" wide. The top and bottom rails are different widths also.