What about building a faceframe (say 1 1/2)  with all the openings for drawers, and putting the sides of the cabinet (plywood) right up to the inside edges of the face frame. There would be an 1 1/4 over hang that would not be seen but would make hanging the drawer glides a lot easier. And give you plenty of overhang to sand or plane down as needed for a good fit. How do the pro’s do it without all the shimming. I’ve tried just about everyone and no one seems to have a difinitive answer. I’m biulding lots of cabinets and they’re all different. Also, what is the norm for backs, both upper and lower? Is there a good book to answer all these?

Thank you

4RNR