Working on the covering for the rear end, using the same stainless as the sides. Cut it to fit then hand curve it lengthwise. After that you start tapping it with a ball peen hammer with the outside sitting on the rug on the floor. Keep tapping lenghtwise and you stretch the metal in the middle, which makes the metal sheet curve lengthwise. This also makes it a very slight "bowl" which adds strength and makes it surve lengthwise and you have a compound curve.
Hard to explain but the pics of it on rightside up and upside down show the amount of curvature accomplished.
regards
Mech