Hey that's great. I've got an empty powder fire extinguisher too that I keep knocking over and couldn't think of a good use for. Every winter when it get's cold enough I think 'i'm gonna build a stove!' but after cutting into one propane cylinder to make a furnace (twice flushed out with and part filled with water, and using a jigsaw to try prevent sparks, with an rcd in line) I didn't think i'd want to chance it again.