In this video I talk about what I'm building, the controller I am using, and spend the bulk of the time laying out and drilling the faceplate for the button box. It's long. But I saw a lot of videos that left this part out. Maybe you can learn from my struggle.

Parking Brake Knob: https://a.co/d/dBWmaNm
Trailer Brake Knob: https://a.co/d/csYNAsX
Pull Switches: https://a.co/d/jkogBmm

I used a dremel tool to cut the brake knobs and flatten the push pull switch and then glued it all with CA