I was also playing around a little while back with putting fiberglass over foam, basically "learning-by-doing", which usually works pretty well for me.
http://300mpg.org/2013/03/08/diy-ton...at-still-ugly/
Mostly, I learned that I don't like working with fiberglass.
I tried building a tonneau cover, with the idea that it was practice for a possible future aero-cap.
Since going through all that, I realized that I am much better with certain materials than others. My father has built several cedar-strip canoes, and I figure that canoe technology may actually be a better fit for me and this project. I started a new thread on aerodynamics on this project at:
http://ecomodder.com/forum/showthrea...cap-25662.html