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An aerocap needs a curve at the beginning, and you can save some length by moving that job to a bulge on the roof, making one smooth line from windshield to cap. Leaving fins at the side is not so good, because air will be trying to spill over, since it has no tapering in to do at the sides. I'd be inclined to leave the tailgate on, and extend the cap at least to the end of the lowered gate, with a flat back. One way to get quick curves and framing is to use large-bore plastic sewer pipe for the lengthwise edges. With a maximum angle, you need rounded edges in a crosswind. Anything you can do to smooth out the front end with an overall cover/grille block will help too. If you won't need to pop the hood, some outdoor window shrink-wrap, taped on, might be nice. Some stuffing would give it a better shape.
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