Somebody done that before (http://www.mac512.com/ccpmg4.htm), back when G4 cube was the smallest Mac available on the market.
However, given that the Cube is such iconic and classic Mac, I'd prefer to keep it intact... Maybe put a Mac mini G4 if you really want to put a PPC Mac inside?
However, given that the Cube is such iconic and classic Mac, I'd prefer to keep it intact... Maybe put a Mac mini G4 if you really want to put a PPC Mac inside?