Im using LuSIDs design on my first cab, and finished wiring the CP today. Ive got two sticks with six buttons each, and in working on a spinner to go in the center. Its a pritty spacious panel, but I dont think it would be wide enough for a 4 player panel. It would do 3 player, you could even angle the controls, following the angled contour that goes along the bottom. Hope this helps you out. BTW, welcomre to the board.