I see where you're headed.
85" inches across the flats? x.25 would be 21". Or it could be more complicated, the distance on the diagonal is 85x1.42.
Now you have a 2Dline in space, effectively a scaled-down version of the typical cross-section. You can bridge to that with either an curved panel, a flat panel or an instepped box. Compare that line to the door-swing of the rear doors or hatch.
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