I'm new to Raspberry Pi and am trying to find info on building my control panel. I was going to build a MAME cabinet years ago and bought joysticks and buttons from Happs Controls. I want to build a 4 player cabinet with trackball and spinner also. Is there a combination of IPAC boards that can handle this or are there other options? Could I make 2 of the joystick/button setups removable in order to swap out for trackball and/or spinner? I'm just trying to see what components I need to buy. There will be 6 buttons per player. Any help would be appreciated.