Switch and indicator cutouts, final welds, and a nice layer of light-grey primer: DONE.
The cutouts were done on Fox's nice DeWalt scroll saw. Strong enough for a metal, even if it's made for a wood.
I didn't bother with super-precise cuts, nor was I particularly careful with the grinder. There's a number of imperfections that aren't obvious in the picture (though the wiggly cuts kinda are). But that's OK: it all gets covered by the printed control overlay, so none of that will show.
Next step is real painting. Humidity is near 100% right now though, so I probably won't be able to do that until tomorrow.