I've made a pretty good wood gas burner out of a paint tin and a normal sized baked bean can, with some disposable bbq mesh. What I didn't get right was the pot stand on the top. A tuna can split down one side with some venting holes worked ok, but wasn't very stable to rest anything on. I eventually used a welded steal candle ornament I got from a pound store cut down to size, that worked very well, but probably doubled the weight of the whole thing. I kind of got fed up with having to keep feeding it with fuel, especially when there wasn't anything dry around to use. Funnily enough, a meths burner inside managed to get a secondary burn from the inner can air holes which was a result.