I know this kills the point and fun of making a SNES portable but I found this search for some parts. http://www.thinkgeek.com/electronics/retro-gaming/bd6f/
Would do you think, it does SNES, GBA, and more.
This in my opinion is a complete buzzkill

Eh, it's as much of a buzzkill as the same emulation on a PSP. Meaning: enticing for the non-DIY crowd, but for many of us, it's more for the challenge.

Plus it's a lot more fun when you tell someone "hey I built this" rather than "I bought this online".