Are you building a 2P cab? I know you are building a "mini" so it seems like it would be way too tight for 2 sets of controls. That said, unless you love playing fighters by yourself I think you'll be able to play most games with a 3 or 4 button layout... but again, it depends on what type of games you want to play and if you are going to be playing console games or not. If it's a 2P simultaneous cab you definitely need the 6 or 7 button layout for some fighting action...