Nice man I think it looks fanstastic!! The glowing feet are a nice touch. WIth the speakers and amp, make sure you dont have the speaker wires running directly next to power wires, that's probably where your hum is coming from, also crank up the volume in the game settings on the 60-in-1 board so you dont have to turn the amp up as high, this will also eliminate ground hum.
Looks like you are almost done, it's weird seeing a clone of mine looking so complete, but a huge compliment that someone else liked it enough to go through the expense and trouble to make one.
Congrats!!