Looks like simple frame and panel. If the top can be removed i.e. it's screwed, not glued, on to the top rails and if the panels aren't glued into the grooves, he might simply be able to slide the panel up and out for cutting (or leave it out entirely) and replace it later.
Always those pesky "ifs".
That was my feeling too. It is hard to tell based on the pics. What look like screws inside the cabinet in the vertical piece of the frame in the corner may allow part of the back to be removed. IF it does it may help, IF it doesn't then Hmmmmmm.