I saw that graph in its respective thread but it was kind of confusing. I think I get it now.
I'd like to do something much like your skirts, but smoother and extending all the way to the rear of the car. I'm trying to figure out the best way to mount some skirt hardware, since my car has some really janky bodywork around the rear arches.
Also, looking back at the first few pages of this thread, if you'd have told me then what I've put into this car now, I probably would have sold it and bought something else. Oh, well. It's here now, and it's fun and efficient.