Sometimes it's going to be necessary to put a scab patch over the thin spot and metal-finish the bulge that's created by the thicker area. A little metal finishing and a thin layer of Bondo can hide a multitude of cobble work. The nice thing about sheet metal work is "If it looks good, it IS good!"
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!