Players 3 & 4 only use buttons 5 & 6 for console emulation (Super NES, mostly). Plus, player 3 buttons 5 & 6 are mapped to O and K respectively to get through those screens that pop up before some games in Mame. The fit is fine since there is enough of an angle to set players 3 & 4 (outer players) a decent distance from 1 & 2. 1 & 2 seem like they might be a little tight and that is one thing that I want to change with my next revision. I also think I may want to change it from 42" to 48" in length and move the trackball down. I think then I should have enough room for dual spinners and a dedicated 4-way with 4 buttons beside it (classic diamond pattern). Also want to add a bunch of detachable controls (Act-Labs Guns, Steering Wheels, Foot Pedals, etc..).