Yes! That's it exactly. It was so simple, I didn't bother bookmarking the page.

For most of the variations (sounds better than "attempts" :-) I used a Leatherman Squirt to help tear the can and make the fold over tab cuts. Just to make sure I could, I built one with only a knife. Takes longer, but it is possible.

It's scary how thin Aluminum cans have become. You actually have to be careful while making these, or you'll screw up the can.

One improvement I made: I found it works better (for me) to punch 16 or so evenly spaced holes in the can instead of all the little vertical slits as shown in the article. The Squirt's awl works ok for this, thumbtack even better.