I'm very impressed with the work you've shown. I really like the way the widebody fits the body. I cant wait to see more.
As far as the side skirt, I think it looks a little tall. You could do a few things to change that. Its hard to tell which would fit best depending on the way you finish the skirt. You could add a rocker panel below the door, and have the skirt attach to that. On the other hand you could just make the skirt shorter and make the ride height lower.