Students at a good idea

They amde a car from waste:

https://www.dutchnews.nl/news/2020/10/its-name-is-luca-eindhoven-students-make-car-entirely-out-of-waste/

They bulit a small electro car and used collected polymer waste as material as well as materials normally seen as waste (I think however that the motors, battery and electronics have not been made from waste.
The car won't hit the road due to regulations, but it is a nice Showcase all the same.

@Ponderable
There is probably enough waste plastic floating around ( literally, like ocean waste) to make all the cars made on the planet.