I built the fog light covers after driving in a heavy snowfall that filled the fog light openings and made the fogs unuseable. The covers are a noticeable improvement in that respect.
Aerodynamics of the covers? Don't know, don't really care. Should be some drag reduction from stopping airflow around the fog lights, but don't need the covers for that.
I used acrylic. Have fun cutting that stuff - it's brittle and wants to shatter. Try clamping between two sheets of plywood when cutting. Polycarbonate is much easier to cut, but the local hardware store had acrylic in stock.
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