Paper and papercraft are incredibly expressive and relatively easy, and in the hands of such masters as these... really impressive.
Designer Taras Lesko's build of a Pagani Zonda supercar. (the video includes loud music... so... be forewarned.)
German papercrafter Dimi created a full-sized Ford Mustang front end in his living room, using corrugated cardboard. (more awful music.)
This one though, a full-sized, complete on the inside and out one, from artist Jonathan Brand.