I can't find my copies of the brochures right now to see HOW they referenced ABS, but IIRC the brochure does refer to fiberglass and ABS in the making of the Terraplane. That doesn't mean they were made in both materials ENTIRELY, bu that the main shell and top is fiberglass and some of the insert panels were molded in ABS, much like the fairings are fiberglass, but the glove-box doors were ABS. Smaller parts are best done in ABS, but the larger body panels are easiest in fiberglass.