We made a few up here at work.
Only need a knife and ONE coke can.
Works VERY well.
Most of the instructions seem to think that when it is finished, it has to look like a commercial stove...
Got the plans for this one from Backwoodsman Magazine

The slits you make with the knife to make the nozzles work MUCH better than you would think.
This is not an open burner style... It is a full double wall center light burner.