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1. See Hucho pp. 142 and 183, and note that front-to-back airflow under the car is much more oblique than you may have thought. Actually, not that much of the flow is front-to-back, but rather obliquely to the side. Tuft tests and under-car pictures or video with a lipstick camera will tell what direction the air under your car is really flowing.
2. Arrange the wheel fairings accordingly for highway cruise speed. In other words, the oblique flow at 35 mph may not necessarily be the same as at 75 mph, so unless you plan a variable geometry pair of wheel fairings, set their toe-in angle to minimize drag at your normal cruise speed.
3. A semi-circular or elliptical planform as shown by your yellow line is good, in fact better than the vast majority of cars on the road today, which were apparently designed by goofy stylists rather than competent aerodynamicists. Ideally, wheel fairings would be confluent with the nose of the car (bumper cover). Presumably, the LoReMo shown in the post above has this, but comparing it to Hucho's Calibra on page 183 has me wondering if LoReMo nose may actually trap more under-nose air and so create more drag than optimum.
Thoughts?
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