Update : Here are some quick pictures of the model that I am making of the car
I haven't worked on it in a while, since the clay is already cracking, despite having a rigid structure to adhere to.
I'll try water putty next ( supposedly, it does not shrink ).
The roof is just an old plastic container lid cut to shape. Everything is just there to to visualize what this thing could look like.
I also built a 3D model for CFD testing of the design, but I found that CFD programs require a special type of 3D file.
Oh well.