The Trabant doesn't get a lot of respect in Europe, for obvious reasons, but it's definitely an unusual collector piece, especially in the USA. The convertible Tramp variant was built for the East German military and border guards (green for military and tan for border guards) and is even more rarely seen.
The typical Trabant sedan and kombi bodies were made of Duroplast, a cotton and wool fiber-reinforced plastic (often jokingly referred to as cardboard). The fibers were recycled waste from other industries, but the pollition coming out of the back end makes up for any green credibility. The Tramp, however, uses duraplast only for it's front clip, which it appears to share with the rest of the Trabant lineup. The rest of the body is steel. The engine is the same 600cc two-cyllinder two-stroke as well, using pre-mix gas (fill the gas tank, add oil, and shake) and producing 26 hp. This Trabi weighs in at just 1400 lbs, so while not great, it apparently does get along nicely enough.