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Anyway,the forebody looks okay,it's only at the top of the backlight that she 'loses it'.
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Compare your windkanal pic (I know the one) to standard practice in Pro-Stock drag racing:
They put the 'shelf' a little lower, at the bottom of the window and use vertical fences. Is that to compensate?
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I would work on the sides.All that you can stomach.
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I want to get to that, but here's what I did today. I cut the redwood stock at 45°, it looks like 40° would be optimal. Here is a longer tail ~48" from the rack, with a 30° wedge at the back.
And here it is with 36" and a 45° wedge.
I photochopped another view, the top, backlight, cooling ducts and the underbody are unrepresented. I think the finished project would have a thin aluminum skin over redwood with the top varnished redwood like an old Chris Craft boat.
With a 45° join, one foot truncation would give < one foot flat on the back. I see the internal structure as a rectangular folded exponential horn that is fed by the engine cooling air below the bumper.
The biggest problem I see with the stock beetle body is the rear apron. Racers make the panel removable; that would free up a lot of constraints on the exit angle of the underbody (one could start further forward) and the cooling air duct (if the muffler is repositioned).
Next I will be addressing the fenders. As a preview, here's a picture that shows how to optimize a Coanda nozzle. I'm seeing a 'innie' louver with a piece of saw-blade (for the serrated edge) blocking the inner half of the opening.
