I don't quite understand the touchpad thing.  Does it do more than just control music?  It seems odd to me to be included on the CP.
Do you have a coin door?  If not, you might want coin buttons.
Are you locked in to the size and shape of the CP?  As mentioned, its a lot of real estate for what you need for controls.  You could probably clip the CP width by 8-12 inches.
Also as mentioned...the power button.  I'd suggest moving that off the CP altogether.  If not, kids will push it on purpose, adults will push it by accident.
BTW, is this a pedestal build?