It sounds like you want a way to set up a system which autonomously creates a product that fills some certain parameters that you set. In this case you want self building/designing cars.
I feel like the alien perspective already answers your question of how. Car manufacturers are already these self modifying car building systems, with humans as an integral part.
I don’t think we can get to “growing cars” without humans as the substrate until something else is able to fill that role such as AI, or in the case of horses, natural selection.
Isn’t this horses?
It sounds like you want a way to set up a system which autonomously creates a product that fills some certain parameters that you set. In this case you want self building/designing cars.
I feel like the alien perspective already answers your question of how. Car manufacturers are already these self modifying car building systems, with humans as an integral part.
I don’t think we can get to “growing cars” without humans as the substrate until something else is able to fill that role such as AI, or in the case of horses, natural selection.