Looks like they've hashed everything out already.Nathan Armstrong envisions a day when drivers will be rolling up to the curb in a car powered by an electric motor and covered with a body made from hemp.
Henry Ford was going to do the same thing with soy. He was even going to make the bumpers out of soy, if I remember right. Obviously, he never got around to it.
What happens to the material if the paint is scratched? What effect will road salts have on this material? Can the material catch fire? I wonder if they've got plans on how to recycle these cars.
Check out the article for some of the engineering details.