I'd prefer lights and an outlet, but it's the only hangar space within 40 miles.
So I looked online and found this: http://www.youtube.com/watch?v=_5bK_ivwXs4.
I just built one using a Coleman PowerShot backpacking stove, and ammo can, and flexible dryer tubing.
I drilled a few more holes after testing last night showed the flame was a bit O2 starved.
Tests today were perfect -- LOTS of heat, adjustable output, and the hose allows directing the heat to the best spot in the cowling.
I'm in no rush to use it, but when it gets cold, I'll be ready!