The SuperCat stove is so easy to build that my 11 year old daughter and I constructed one in about 10 minutes, and that included feeding the cat and washing out the can.
I tested it 3 times but it was under less than ideal conditions. My windscreen was not completely effective, the aluminum pot was too large/thick, the garage floor was cold and the air temperture was about 4*c. With about 1.5 oz of Heet fuel in the stove I was able to just get 2 cups of water to the edge of boiling in 9 minutes.
The set-up needs some more tweaking, but it was a fun father/daughter evening adventure making hot chocolate at the edge of the garage, while the neighbours looked at us strangely!
Mike