a couple of years ago, I thought of doing a case mod, or perhaps more appropriately given my lack of skill, a "case-mangling" so I could install a Beige G3 logic board into the 7200 case.
I let "Olde Mac Milt" talk me out of it though and ended up buying the 7500 logic board instead... which, incidentally, I still can't find anywhere in the house. :-/