My use for these is primarily for use as a heater rather than as a stove. Favorite so far is simply two can bottoms compressed together with a good amount of fiberglass insulation as a wick. It's about the thickness of a hockey puck, weighs nothing and is adjustable (sorta).
All you need is two cans, scissors and a pushpin. I drill a 3/8" hole in the middle of one of the bottoms, cut the cans with one being about 1/8 inch longer than the other, stuff it with plenty of insulation (white Johns Mansville seems to be better than pink) and compress the cans together. You can round out the top part on another can bottom to make it a little easier to mate to the bottom. Then poke 4 holes on the angled part of the can as it comes up to the rim.
Pick about an eighth of an inch of insulation out of the center hole. The top can should be slightly longer and extend down just past the rim of the bottom (just past the label). Then take the back end of something round and hard like a ratchet handle and burnish the edges so that it makes a seal.
The MSDS sheet on HEET says that it's 99% Methyl Alcohol and 1% proprietary additive. I think they do this so they don't have to pay taxes on alcohol. Maybe not. Also, I just found that a bottle is less than $2 at Walmart. This should be a safe heater in confined spaces like a tent as it should only put off CO2 and water, from what I understand.
What I like about this design is that 1) the center wick flame puts off yellow light and burns slow. 2) it won't spill or really pressurize with heat. 3) you can adjust it by obviously pulling more wick out or by not lighting the side burners. To light the side burners you just tilt it so that the center flame lights them. You can snuff these out by quickly putting your finger on the holes. It doesn't hurt. 4) it won't blow out with wind, but a quick puff will snuff it. 5) The holes unlit do not bleed off fuel. 6) you can poke another four holes and easily use this to boil water.
I JB welded an aluminum tube on the bottom so I can shove it into the sand for bank catfishing at my dad's place. Where I sit it's a pretty steep incline and this brings the heater up where I need it. Also I've used it in a shooting house to keep it positively toasty.
An ounce of HEET will burn on low for about half and hour and about 15 with eight burner holes and the center flame running. Could have made a video in the time this took to write up, but there are tons on youtube, just not for this specific design. You can make one in less than 5 mins. Mine looks like a shorter version of this with less holes. Also the center flame burns about 1/4 the height of this one. Just right.