This was more of an experiment in masking (pardon the pun) than anything else.
The material is white melamine covered MDF. I covered the panel with MacTac vinyl, then cut the pattern with the combination of a 1/8" ball nose and a 90° V bit. The ball nose was to take the wider cuts down to 1/8" deep and the V bit to do the narrower cuts and all the edges. It’s a bit hard to see that it is 1/8" deep max because of the black paint and my bad photography.
After the cut, I sprayed with a black primer that I had kicking around, then removed the MacTac. I was happy with how crisp the lines ended up. The MacTac cut cleanly with both bits, leaving a nice sharp edge for the paint.
Anyway, here it is, just for fun.