I once saw a homemade wood stove in a motor home. He'd welded 1/4" plate on both ends of a 12" piece of old well casing that he'd squished to an oval shape and made a door for it. He had it mounted on some bricks on the counter top. He could use it for making coffee or whatever, too. It put out way too much heat even for a big RV. It must have been 90 in there while it was way below freezing outside.
