Took some more measurements and mocked everything up in cardboard this time.
The switch panel came in so it gave me an opportunity to verify everything is going to fit. A couple of leds on the panel didn’t want to cooperate so the company is going to send me a replacement.
If I get time this weekend I will probably try my first attempt at making the face plate out of the fiberboard I got.
Still need to buy the head unit I want, plus wire everything up.