Not sure where you have the coin in buttons? Or are you hooking up your coin doors for that? also if you don't plan on playing Golden Tee, then the 3 buttons in front of your track ball are fine, otherwise, I'd move them, to the left or right a little so that a hand going forward doesn't fall on top of them and hit something. It's hard to tell the depth of your CP, you may want to move everything down more towards the front of the CP, instead of having it all pushed to the back, and Take a look at the Ultrimarc E-stick same as the Happ Universal, only the top of it rotates, so you don't have to open up the CP and make an adjustment, but that's all personal preference.
Other than that you're looking pretty good there I think