Pulled the aero cap apart and have started tapering the rear a little bit. Since I made the aero cap modular, I just had to take out some screws and pivot the sides in. Some support straps to fix it in place, measure some new panels and screw them in. Redo the hatch fer the new setup. I'm looking at pulling the sides in about 6"...12" overall.
A rough estimate on the left side...
The cap opening will be about 48" wide at the rear.