Yep, I pulled out all the stops! The underside has about 6" clearance at the front and it rises to about 11" at the back bumper.
Front and back wheel skirts - hinged in two pieces in front, naturally. The tall triangular slots on each side just above the end of the bumper are cabin air exhaust vents, so the air flow will (hopefully) get pulled out of the car, and it will help keep smooth attached flow. The inside vents are temporarily covered - you can just see the left side one in the 2nd photo above.