This one is my last project. I made the spinner hack with an old mouse (explained broadly in the web). I have chosen from mame4all up to 50 roms that use a spinner (Pole Position, arkanoid,...). I made the cabinet from pine/plywood, and the artwork is based on Pole Position. 6 buttons are enough: exit to front-end, start, coin, and three buttons for the gameplay (most of the games need just 2 buttons). Here is the result: