Love MAMEcabs, but I hate the ones with 20billion buttons.
All you need is two sticks, 6 buttons per player, and two start buttons. If it's just MANDATORY that you play stuff that uses a trackball- build another. Also, nearly 4K for a MAME cab is ridiculous.
at the very most base the size of the CP off a 4 player blitz if you had to have 4 players, but even then can make it look pretty factory and there is NO NEED! for all the extra buttons, I never understand that, yes you have a button for coin, pause, menu, but heck even my 4 year after showing her can coin up a MAME using the player 1 start and button 1, makes it a lot cleaner looking! if that machine was 2k then yeah much better