Did you ever get going with this? I wouldn't pay $250 for a working cab only to turn it into a Mame machine. I would either try to find a non-working cab(which is what I did~$25) or build it from scratch. IMHO the problem with going 4 player and using an existing cab, from what I can tell, is you get a bigger cabinet than you might really need. Only the control panel needs to be larger and if you build the cab yourself you can size it to what works best for your space or if you mod a 2 player cab into a 4 player you might be saving room, weight ect compared to a 4 player model.