Dear ChokeUoutcold;
Bending aluminum plate isn't really all that difficult for the home craftsman if you have a hydraulic press handy. What you will need to do is to locate some 4" OD pipe and some 4.5" ID pipe. I cut mine about 18" long and then split them lengthwise. These will the 2 forms using for bending the 90 degree angles. Then weld a piece thick piece of flat stock to the center of the 4.00" pipe lengthwise about 12" tall and then weld another piece of flat stock to the bottom of the vertical piece, forming an inverted T. This is the stand that you will need when the aluminum bends around the press into a 90. Then I take a sheet of fairly thick rubber and glue it inside of the 4.5" piece down it's length. This is to keep from marring the shiny outer surface of the aluminum while it's being bent. The rest is easy. Just place a length of aluminum flat stock on top of the 4.0" pipe, which is now situated 12" above the bed of the press, and place the 4.5" pipe directly above the 4.0" pipe. Now come down on the 4.5" pipe with the press slowly and the aluminum will bend itself between the 2 pieces of pipe. Cut the aluminum stock long enough to have an 1" or so extra after it's bent, then slap it up to the body, mark the inside of the aluminum where it needs trimming, remove, trim and deburr. And that's all there is to it.
Your friend;
LAMAR