You can also print it out full size for a pattern and use a hole saw to get most of the job done. Then just sand until the gauges fit stuggly. I made mine out of 16g steel and it went well. Cost me maybe $35 for a hole saw and a sheet of 16g. Just make sure you print it out full size (check the measurements against print out). I had a little trouble with this at first, but eventually got it.