I just wanted to post a link to another DIY for a wood gasifier stove.
It is a 4" diameter version of the wood gasifier stove. It can boil 2 cups of water at 8 minutes at 3200 meters and doesn't need to be refilled. 1 handful of twigs should be enough for more than 2 cups of water. As is normal with these stoves it leaves hardly any waste.