I built the framework out of cardboard, masonite board and painter's tape. Then added details with modeling clay. Once I was happy with how that was looking I fiberglassed over the entire thing to give me a sturdy base to work with. Then using polyurethane foam (my new favorite medium) I added additional details until it roughly resembled the shape I'm going for. Once that was looking good I glassed over then entire thing again.
Now I'll sand away at it to fine tune the shape until I'm happy with it.
Next on the list will be cutting it into three pieces so that it can be stowed in the car when not in use. I'm considering adding a few bells and whistles, like a third brake light, wind blocker and possibly LED lights on the inside to help see what we've tossed back there at night but those things seem like a long way off at this point. Cutting the shape down and getting it symmetrical is going to take me awhile to get right. The more I sand, the more I have to reinforce the underside or I'll weaken the integrity (and we all know, no matter what I say to people, someone will sit on it).
![Image](https://i.imgur.com/5SW3Kme.jpg)