Said it once, I'll say it again, those buttons are cool.
But I got to say something about the placement of them.
I put the buttons on the front of my second machine, "Adam's Arcade". After machine was built he said that people would lean into them and hit the red Quit button, and end the game
You just have the player start buttons there so it might not be a big deal.
Adam lived in Louisville at the time so it wasnt like I could help a lot.
He found some button covers that fixed the problem.
First pic below is the buttons without the guards, second is with the guards.
After that little fiasco I promised myself never to put buttons on the front again, but he didnt cover his P1 and P2 start buttons, so it may not be a problem if thats all you are going to put there.