A 55-gallon drum can easily be converted into a woodburning stove. We had one in our log cabin, and it kept our uninsulated box of logs quite toasty, even in the nastiest of central Illinois winters.
My buddy has a hunting camp at higher elevation in upstate NY with a huge wood stove welded from 1/4 inch scrap plate steel. Couple of iron hinges weld in place make for a door. Places goes from 20 degrees to sweating in one hour.