I got my first attempt at side skirts done:
For right now, they extend down about 9 inches, leaving about 5 inches of clearance. I only did the driver side for now, I want to see if that's enough clearance before making the final versions. After seeing this one, it's also clear to me that I want to extend it a little more in the front and quite a bit in the back. The reason this one is the length it is is that it's 8 feet (the length of the thermo-ply panel I had).
I attached the panel via some fender washers and the pre-existing holes on the inside of the body panels:
I should be able to get the passenger side skirt done tonight. Eventually, I think I'll make some nicer, painted version. The nice part was that I had everything except the fender washers lying around already.