We've seen (and built) some of those Japanese (and other) F1 car models. In my first attempt, I tried using a very thick and stiff grade of card to construct a Ferrari. That had several outsized parts which wouldn't fit in where I wanted them to, and some folds wouldn't happen neatly. I then printed a grayscale version of that model on thin printer paper, and the parts fitted in a lot better, but I fear for the stability of such a model. That, of course, was when my printer ran out of ink. What kind of paper is suited best for that? I'd like to design a more current (or less designed) car, especially the Red Bull, new Renault and the Force cars.