I'm basically trying to build that, though I'm still not sure how to solve the probably biggest problem of all - making the chip appear as a game controller for windows.
I've snooped around the forums for some answers a bit, but haven't really found anything conclusive for my situation.
I suppose UnoJoy is out, since my chip is different.
If it changes anything, I intend my "game "controller"" to have 4 or 5 buttons and 3 analog axis given by two accelerometers.
So, is there any program or bootloader that could make this work or should I just forget about the whole thing and go eat waffles or something?