You stole my color scheme!

I actually was going with Y/B/R/G setup so my secondary panel with the dual trackballs can match the Marble Madness setup and still retain the same colors as their respective start buttons.
Yeah, you're going to be doing quite a lot of squat thrusts inserting coins, but if it bothers you that's easily fixed. And what are those buttons in the back for?
Otherwise, pretty solid. Congrats on your future little game player.