So I got bored and picked up a flashlight from Walgreens. I believe it's the same one Cisco used in his tropical magnum mod...I went with blue, though:
The only real problem I ran into was finding a way to mount the PCB inside, as it's a bit smaller than the inside diameter, and I broke the metal retaining ring that originally held it in place. I finally just filled the entire head with hot glue, and it seems to work well enough, although going back in and fixing anything with be a major hassle.
I think I'll like it a bit more when my 18500s come in, and I can stop using the PVC sleeve to fit a 14500 in there.

The only real problem I ran into was finding a way to mount the PCB inside, as it's a bit smaller than the inside diameter, and I broke the metal retaining ring that originally held it in place. I finally just filled the entire head with hot glue, and it seems to work well enough, although going back in and fixing anything with be a major hassle.

I think I'll like it a bit more when my 18500s come in, and I can stop using the PVC sleeve to fit a 14500 in there.