Hmm. I don't have my layout file here, but I'm building a cabinet from scratch that's based off Centipede plans, and I will have a trackball on it. I did extend the control panel to be 8 inches (I think that's right) from back to front, though. If you'd like a copy of my plan for my cp, shoot me an email and I'll try to get it from work, where I developed it.