Modding DC Agetec for xbox 360?

Anyone have some links on how to go about doing this? I realize the dc only has the 6 face buttons and one start button. How much modding will I have to perform to get this to work with some 360 controller pcb? I would guess I need to at least at an XBOX guide button in there, any tips if I have no spare buttons? I have light soldering experience and modding rockband/gh guitars. No drill, no dremel. Just an exacto knife, nail clippers, and ingenuity. The exacto knife alone shaved off a few hours of nail clipper/ingenuity madness.