If I was to stick to Basjoos' parameters and have one for the roof, I'd try to find out just how small the vertical height could be while still being functional, and spread the width out to the drip rails (or door gaps) on each side, and put a generous amount of tumblehome on the sides. I think the front would be the least influential of all the surfaces of the box but nonetheless either have it extend the curve and slope of the windshield, or heck make it square but have generous radii on the side and top edges. Let the back of the box follow the template down to a point.
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