Rear Wheel Skirt Completed. I'm going to be doing the other side tomorrow and hopefully I can pull the car out of the garage and get a nice side shot with the skirts on.
For now the skirts are just taped on, but depending on how they act on the highway, I may add an aluminum rib underneath because right now I think the air might push down on the skirts so that they make contact with the wheels which is undesirable.
I also concluded that aside from a flexible membrane, there is no way to make front wheel skirts on my focus without increasing the frontal area a whole lot. Therefore, I added a wheel arch gap filler. I'll be doing the other side tomorrow.