I needed an electronics cavity for the Freestyle bass that I was working on, but all the existing cavity templates were too big or too small. The only option was a custom set of templates.
Using some scrap acrylic (all builders should have some scrap around the shop because there are so many uses for it) I measured and laid out a paper template that I transferred to the acrylic. I then slowly and carefully hand routed the acrylic until I had the template that you see in the first pic.
Using the templates, I was able to quickly create the cavity and cover that I needed.
Now I have a template for future electronic cavities.