re: Removable Rear Panel

Ron - I have considered mounting recessed magnets on the panel edges with matching recessed magnets in the cabinet.  The concern I had with that method was that it relies on the strength of magnets as they're sheared apart, which is much less than their strength when separating them perpendicular to their faces.  I thought it might be too weak.  But, it's something I will mockup.  I do have some 1/2" diameter magnets on hand.

For the pull, I had been considering a routed finger pull at center top.  But I may keep it even simpler and eliminate the pull altogether.  I checked, and I'll be able to reach in through the front and push the rear panel out.  Not elegant, but simple.