Things I would change if (when) I did it again-
I didn't center the trackball. I cheated it toward the player one joystick so their would be more room to spin it without hitting the player 2 joystick. There would have been more than enough room if I had centered it. Right now the edge of my palm hits it when I'm using player one buttons. Not bad but it would have been nicer to fully rest my palm there.
I forgot to drill the holes for the trackball before applying the vinyl. The drill bit messed the vinyl up a little and the edges around those buttons aren't as nice as I'd like.
I didn't use a mounting plate for the trackball so you can see and feel the edges of the trackball housing through the vinyl. Next time I'll fill and sand so that its smooth or use a thicker/stiffer overlay. Otherwise that method of mounting is great.
Oh well, build and learn.... I'm working on my secound and third swappable panels. The secound is ikari warrior rotating joysticks, I finally have all the components needed. The third will be mostly empty except for a 4 way joystick and player 1/2 buttons, it will protrude out the front for a lip to mount my PC steering wheel on it. I'm considering hacking my flightstick to mount in this panel but for now just having a big flat area to place it will be good.
I also have 2 cabs in my garage with a third on the way... I"M OUTTA CONTROL!!!!!!!!!