Need quick help before bid goes out! PS3 Dual Mod

Trying to pick up this Arcade stick. But I was wondering is it difficult to mod a PS3 to play XBOX360 as well.

Not hard.
Just add a Mad Catz FightPad or Mad Catz #4716.

Provided that the PCB is common ground like a TE or SE. Not sure of some Hori PS3 sticks though. Otherwise you will have to gut the original PCB for a common ground one.