Kirby did an absolutely great job. I ended up slicing this into 11 parts, so I could drill and otherwise route it out for wiring, trigger and 21 LEDs. Kirby provided a version with a cavity in the handle for a battery and I soldered two AAAA batteries together, and they were a snug fit. The compartment cover fits perfectly and it stays in place with friction.
Great job Kirby. Now I just need to finish the other one.