Maybe you don’t realize but one of the major issues with modern cars is firmware compatibility. Porsche is super egregious about it, others do it. But basically let’s say you take a gearbox out of a specific car because it’s wrecked. You need a laptop from a dealer to pair the replacement. They not only will not sell you the software or connector, they have legal protections that say they don’t have to.

Hell, even DRIVE your car.

Ok since no one here is giving actual information, there was a guy on Rich Rebuilds channel a few years ago that had done a lot of work in this space. I think it was this video: https://youtu.be/o-7b1waoj9Q

Any way, at the time he had made a ton of progress on the hardware. I don’t have the mental energy right now to dig in to see how it’s gone, but feel free to do so and post back.