"Satin metal" is galvanized, it should be available from your local UAP NAPA store or autobody supply shop....just ask for satin coat steel and specify what ga you want. I would suggest 20ga. Napa carries it in 4'x4' or 4'x8' sizes. For some help in your metal beating lessons check out >www.allshops.org<....Roy

It's easier to get older than it is to get wiser.