I should probably clarify that the exact type of aluminum doesn't matter much, given that it all melts at about the same temperature. I'm guessing Tony recommended 2024-T6 because it's a little stiffer than most others and would look better, but if you've got any kind of .015" aluminum around, it should do just fine.
Mark Langford ML at N56ML.com website at http://www.N56ML.com --------------------------------------------------------