How would that work? Download the car's design (you wouldn't...) and have it manufactured by someone with the right machines?
Perhaps with some funding & technical assistance they could be convinced to do so for EV Vehicles.
https://www.opensourceecology.org/
"We’re developing open source industrial machines that can be made for a fraction of commercial costs, and sharing our designs online for free. The goal of Open Source Ecology is to create an open source economy – an efficient economy which increases innovation by open collaboration."
For those wondering whether this is just a joke, it most certainly is not.