Wow. It's been a while. Oh wait- we're in a recession and I have no liquid assets! That's why!
Anyhow, I ordered up some 12"x24"x0.08" (2mm) 7075-T6 aluminum plate a couple weeks ago. The other day I got around to cutting it up. Here's what it looks like now:
I also ordered a 12"x48"x0.025" piece of polycarbonate to make the sides and the internal support structures. It came today, so hopefully next week I will have time to cut it up a bit. I'm going for the "speed wedge" look, with a twist- I'm going to design a venturi into the top so that it will create a vacuum inside the body and (hopefully) help stick the car to the road.