I thought this was s cool idea and probably something that could be DIY. I know many folks have tent stoves for hunting an stuff.
Might not be the most incognito way of heating a space in the house, but if you had a week like a couple weeks back with some negative temps, you may find yourself wanting to get warm.
http://www.cylinderstoves.com/window...kit-p-121.html
I have a Mr. Heater Big Buddy heater if I have to take the chill out of the air, but you can only store so much propane.
http://www.amazon.com/Mr-Heater-MH18...g+buddy+heater
What do you all have? Or do you have any better plans?