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It seems to me that the front skirts are of "minimal" benefit, probably as the air has not fully reattached to the side of the car, after getting bunched up on the grill area. If the car has the "template" pattern, looking down from above, then the air would be smoothly attached, and enclosed front wheels would be "worth" pursuing. You can see many of the aero cars of today have the rocker panel areas pinched in somewhat, between the front and rear wheel wells, and roof indentations, this is where the airflow "wants to go" after coming around a corner. This was very evident while doing cylinder-head flow bench research. If the air "wants" to go there, give it a space, if it doesn't want to be there fill in the space. Decreasing the turbulence results in smoother airflow and less drag.
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