Super Cat Stove made as described on this website
I used a standard paper punch to do the holes. I first made a template with a marginally stiff paper that would wrap around the can. I drew the hole per dimensions show on the website and then punches holes in the template. Then I taped the template to the can and made the circles on the can with a marker, then punched them out. Since I made the template it is very easy to make more stove fast.