Narrowing the rear wheel track to be able to taper the rear fenders in plan would help lower the drag quite a bit -- by up to 40-45%. Your Mk 10.2 (and 10.3?) appear to have this. But the sides need to taper smoothly, and not "re-expand" around the rear wheels.
If you widen the front of the cabin slightly, the rear passenger could gain some much needed legroom; by letting their feet rest between the front seats. They have to be able to climb in to the rear seat, so this space would be well worth having.
The other point of reference on the Illuminati 'Seven' is their solution for gaining rear headroom for the rear is to have the rear passengers face backward.
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