Here in Oklahoma the correct way to assemble a car is done with the VIN inspection by law enforcement of the original car. They will give you the correct paperwork to be able to register the assembled car. I am sure this would vary from state to state.
Yes it is not that way here in Pa. A out of state car does not need a inspection to get a title. Just a tracing of the vin. And a old registration. Owner doesn't have to be present.
Another words if I take my neighbors car and transfer it to another state with the vin only. I can bring it back to Pa. and its mine.
My 69 Corronet R/T was taken like this in 73 . I see it and I called the Police and there is nothing I can do. The new title supersedes the old. After 7 years the theft report no longer exists. If you don't keep updating it. So now my car belongs to a old friend. If I find the car on the road I will run it over with my Diesel. Then give my insurance my title which I still have. Then see what happens.
