[aerohead]

* a set of blueprints would help, especially in plan-view.
* in the favorable pressure gradient of the A-pillars, flow attachment there could be a walk in the park, as Piotrsko mentioned.
* changing the T-100's windshield to that of the Dodge Viper only gained Spirit delta- Cd 0.005.
* As Hucho says, once flow is saturated, no further rounding makes any difference.
* The 'big-booty' on the Hispano would counteract some of the benefit of the greenhouse's plan-taper.
* For instance, the 2021 Maserati MC20, @ Cd 0.38, might have been Cd 0.319, according to Elliott G. Reid's plan-taper research at Stanford University. That would be McLAREN F1 Longtail territory, really good for a supercar.
* And speaking of, if McLAREN ever publishes a Cd for their Speedtail, it would be insightful. It also suffers the wide rear, compared to the greenhouse.
PS In 1986, Hucho mentioned the high cost of compound shapes, 'enjoyed' by the air. A windshield for LeMans GP car was $ 10,000 at the time.