I threw together a site showing the model I use in my avatar, as well as the beginnings of the model I am using to design my 6 to 8 person Tear.
So far only the frame is together, but I am working on it nightly.
I am using a 1" = 1 ft scale, and the entire frame is made out of popsicle sticks (my kids had a box of 1000 of them so why not use em.
anyway, so far only the frame springs (also made of the popsicle sticke) and wheels are on it, while I work on drawing the curves (real bugger to get right).
http://users.adelphia.net/~marckm/teardropmain.html