The show car's frame was made from aluminium. but the production monocoque frame is made of steel and covered by plastic outer panels like a Lotus.The Gullwings give the car not only a nice distinctive figure but also promotes the body strength with the high side beams.
The new inner structure then supports the AZ-1's array of outer body panels, all fashioned from fiberglass. Since these composite panels simplt bolt on. Mazda could later come up with a different set of skins which would then be a very cost-effective way of restyling the car.