@ejerud We made killing cones like this, and they are great! I agree with one of the previous posters......it is good to have two cones.....keeps the process moving along a little better.
We used a ball-peen hammer to smooth the seams which worked very well......then the rivets. I used my Dremmel to make a keyhold to hang onto a nail without worrying about it falling off, so it could be taken in out of the weather.
Oh, one more thing.....we got our sheet metal at Lowe's.......LOL.