Steve, welcome and thanks for the introduction. We mostly deal with the thinner gauges of sheet metal up to about 16 gauge. There are some art projects posted on the site that have used heavier gauges in stainless steel, corten and aluminum. Kerry Pinkerton probably has the most experience dealing with the thicker gauges on the site. Hope you enjoy the site and find it helpful. Thanks for joining us.
Here is a link to a thread you might find helpful.
http://www.allmetalshaping.com/showthread.php?t=4319