Safety first, dad!
SVG courtesy of: My SVG Library
Masking courtesy of 3M.
The whole scoring/cut (400% video speed), an inside view.
I took a pointer from @Jules, and I’ve bought a pick…several of them, actually. A little creative weeding later, and we have:
Overall, I’m happy with the results, and a friend wants to buy one off me. I do want to clear coat it to protect the masking, which has helped make it so striking.