If it's so simple why don't we see regional manufacturers popping everywhere?
When was the last time a new car company was started, pre-EV?
https://en.wikipedia.org/wiki/Saturn_Corporation
And it wasn't entirely independent. Before that it was DeLorean? But he was kinda setup in a trap that put him into prison.
You can import a car from china in a crate that fits on the back of a pickup. But it won’t be legal on roads until it gets things like a DOT approved windshield.