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I'd suggest modelling after the proven aero cars like 1L, any of the Probes or PNGVs, whatever. I don't think the man on the street is going to do better by eye than a professionally engineered, wind tunnel refined design. As you contemplate this more you may realize more of the shortcomings and unacceptable functionality compromises your current proposal has- better to consider them now, before you've invested time/effort/money building something.
Here's a lil thought experiment: I appears as though the driver's eyes will be about 6 feet away from the windshield. Maybe the effect can be approximated by sitting in the back seat of a TransPort dustbuster van and imagining driving it from there...
Another aspect is, you don't want sharp leading edges. Those A-pillars are going to have to change.
How about some boat-tailing- surely there are x-winds where you drive?
Ground clearance? Ramp angles for driveways and such? Solar gain? Reflections in the glass?
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