I like the classic artwork.  Very nice.
I see a few things.  
Pause and Exit are entirely too close together.  You'll end up quitting a game by accident.
Is 'Player 1' button the Coin Up or Player 1 Start?  If it is Coin Up, then I don't see a Player 2 Start, which is bad.
Are there 4-way games that require 4 buttons?   Or is that for other gaming systems?
From personal experience I would shift your 4-way joy a bit to the left.  It is going to get whacked during trackball use.
Just my opinions.   Looks like you're well on your way.