BamZipPow -
This is NOT your exact configuration, but it does show benefit :
When they were making the GM EV-1 they chose partial wheel skirts :
They could have extended the skirt down more, but they were happy with the compromise.
If you look at rear view in this picture you can see that you *could* extend the EV-1 wheel skirt down even more :
When I say this I am assuming that the suspension doesn't make the rear wheels bow too much into negative camber when the car bottoms out :
CarloSW2