I mean... it's not impossible to make full on working cars with this. It's just how they would perform would be the issue as you can't really use heat as for energy considering it would melt. BUT, possible nonetheless and will become even more possible as we progress into the future.

Now, for car parts, people have been doing this for quite a bit now. Seen guys make custom cup holders, even molds for things they want to recreate with fiberglass. Quite cool