Once again I made a poster board template that I would use to get the profile close to what it needs to be for cutting the aluminum. I got the template close and then drew the profile on the sheet of aluminum.
After rough cutting the profile I checked the fit.....made more adjustments.....check the fit again...made more adjustments.....and so on so on. When I finally got it all fitting right I cleco clamped the cover and drilled the locations of the screw holes I would need to attach the plate.