this actually has already been done before. retrousb.com has been offering NES and SNES converters to GC ports for a long time and raphnet-tech.com has been offering Genesis/Master System/Atari converters to GC for a long time (I actually just got the Genesis one and I absolutely love it). I do like the idea of converting 3 at once, so I will hold off on the NES/SNES ones until this one comes out.