Thanks! Here's the latest mod, a variable voltage (LM350T) twin 14500. This is the 2AA emergency cell phone charger I previously mentioned (the black one). Looks cleaner than a box mod, and had more room for the VV circuitry. Now I need to learn to build a compact booster for the hairy nose mod.
It overheats pretty bad with a dual coil, but works fine at 4.1 volts on a 3.2 ohm. Not too fond of the button placement... but this ones got an actual power switch as well and I was out of other places to put it. I'll have to rethink it, but the next one will definitely have a switching regulator in it.