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...we ought to have a sketch so everyone's on the same page....
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Apparently.
I'll try it in Wings3D. It's pretty simple in concept—full body of revolution truncated. Take a torus' inner 'core' and stretch it (actually, Scale Radial) to make a trumpet shape. Graft it into the truncation (carefully counting edges to make Put On work) and half-body the whole thing. Easy peasy, it should take ....hours.
Meanwhile what about this?
http://www.roadandtrack.com/new-cars/a3821/retro-1945-bugatti-veyron/
45° is the optimal windshield angle and the Beetle body could get there by cutting a slit across below the windshield, slant chopping the rear and removing a foot or so above the C-pillar. A steering column drop and chopped seat bases might help. Unfortunately, a MBT would go right where the VW engine is.
Less headroom and ground clearance equals greater fineness ratio. It needs for the side scoop to go all the way to the drip-rail, like the new Bugatti Chiron.
EDit: Well that didn't take long, mainly finding the squircular aeroform on an old thumb drive. I cut corners by just inverting the tail and re-contouring it.
Hopefully, you can see how the thickness of the bottom rear edge can contain the rear wheels. The vein running up the middle bottom is like R. B. Fuller's 'air keel' in reverse.