Thanks!
Everything is made from what I believe is an ABS 12x12x.625 sheet. Not 100% sure though. My son purchased a pack of them them to do something for his 2014 Raptor and they've been sitting in my garage for 9 years. I was actually using it as a trial but was pretty happy how it came out...
I used a router and flush trim bit. I created a box that was the size of the hole I needed. Attached it to the back. Drilled a small hole and routed out the hole.
The white part below is the jig/box. The rest is just to hold it in place.
Below is the inside of the box.
I created a bracket...