I think you have too many buttons. The trackball is right next to 7 buttons belonging to a joystick already. What's the harm in using those? I'm sure track and field will be awesome using one of the 14 other available buttons nearby. Why do you need 5 more buttons around it? Ditto the Tron Stick, it's surrounded by buttons. If you're going through the effort to use a U360 is there a reason why you need it off by itself? Wouldn't it do fine as a primary stick since it's so configurable?
I'm all about the push pull spinner, have one myself. Why would you want that way up at the top of your panel where you have to reach for it? Also, with all that space I would recommend spacing your Tron stick and spinner a few more inches apart so you're hands aren't on top of each other. I built a 17.5 in panel for my bartop, I have no choice, you're got what looks like an acre, give those two some room.
It's yours man, and it does look good now, but I think that you can do some refinement.