There is a tiny spot at the top that is just enough to fit the player 1 and 2 start buttons. Can't put buttons that high anywhere else on the control panel due to physical constraints. They look really close to the top, but I think that's okay for this prototype. I've actually shortened the control panel by 1/8" to account for a slant that I'm going to have to deal with later. That'll make the buttons have a bit more wood to the north of them.
I decided to give 3 inches of clearance to the left side of the player 1 joystick plate in case player 1 is resting their hand on the control panel to the left of the stick. There isn't as much clearance to the left of the stick for player 2, but I'll see how it works. Two player is going to be a bit cramped no matter what on this narrow of a control panel. When I'm playing one player, I'm actually likely to use the player 1 joystick with the player 2 buttons since that is more comfortable for me.
The hold-down clamps are in the way on the right side for the buttons, so I had to move player 2 to the left a bit.
I'm ignoring the admin buttons for now. The tiny buttons that I'm using are shallow enough that I may be able to get them at the top of the control panel with some creative routing. At some point I'm probably going to have to start asking opinions on how to mount those tiny buttons if it doesn't become obvious.

I haven't fired up my router yet, so that's more to learn about.
Going to hopefully build another prototype today with this as the basis:
