In Gurgel's case I think it was both. On the one hand, it was styllistic, because all their cars had that look, from minicars to trucks. Even their logo looked

In Gurgel's case I think it was both. On the one hand, it was styllistic, because all their cars had that look, from minicars to trucks. Even their logo looked as blocky as their cars. See for example the X15: https://i.imgur.com/vLiH8I1.jpg https://i.imgur.com/vLiH8I1.jpg On the other hand, they were made from fiberglass or "plasteel" (a composite of fiberglass and steel), and I'm not sure how mouldable that material is.