A car is not an vacuum cleaner.
It is a complex device with tens of thousands of parts going into it. As a result, building cars in this day and age is a massive cross-border trade exercise. Car manufacturers source 70%+ of what goes in a car outside their organizations and usually (in Europe) across the border. It will be interesting to watch Mr Leave Business Poster Child trying to sort out his supply chain to build anything that size and/or complexity. That calls for some Popcorn.