before making my mini swansons wood stove, I made a very similar design out of a progresso soup can. this stove is slightly wider and I can actually nest my chicken broth can inside. Any way my point is that you dont need to use a drill, the nice round holes from the unibit are better looking, but on my first stove I made the holes square by using a utility knife. It is not quite as nice looking but it works the same and I doubt your scouts will care :-)
also, have you had your scouts make alcohol stoves, I like these and is my favorite type of backpacking stove, all you need to convince them is that freeze dried food tastes good.