I have a CP that is 12 tall by 24 wide is there going to be enough room for say 2 players with 6 buttons each and a track ball
This has been addressed fairly recently so be sure to do a quick search for more answers. I think the consensus was yes, but be a little smart with the spacing. My panel is 25" wide with the same setup (two players, 6-buttons, 3 inch trackball. I made sure my joystick plates were vertical, I stuck my buttons as close to the plate as possible and I even let a button bezel overlap the trackball plate (you don't see the plate if you recess it).
But YMMV - Sketch it up and play around.