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Your rear window as windshield idea looks...very strange. Not bad, just strange. I think a lot of the readers here will tell you that you're mostly filling up stagnant air space and not going to experience a big improvement
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I guess itīs a common misstake to judge aerodynamics from a sideview only, or from any limited views you get from photos. I too guess there will be almost no aerodynamic improvement to the air flowing over the roof. What I hope (not...) will happen is that the softly roundes sides of the rear window will reduce turbulence/detachment of the air that otherwise travels around the A-pillars to the door windows.
A much less radical way to smoothen the A-pillars is to shave off the rain gutters but they still form quite sharp corners. When driving at highway speed the low pressure zone at the door windows can easily be felt by reaching out a hand around the mirror.
Except for the A-pillars forming a rather sharp corner, things probably get worse by the side in-sunk location compared to the roofline and A-pillars. Itīs a big difference compared to a modern car but I may need to post some detail photos to make it clear to those who are not familiar with these cars.
Honeastly, I donīt like the UFO-look the car gets from the rear window windscreen. I actually hope that itīs not worth the effort but it feels like a rather good idea after taking care of the rear end properly.