Heh! Yes, a friend-of-a-friend did that once, when stuck with a company vehicle where buying a new car would involve a preposterous amount of paperwork. After the car demolishing accident, he took a cutting torch to the beam holding the VIN plate, welded said beam into an intact vehicle of the same model, and declared the original fixed. Legally, this was the case.

Lisa's pickup is approaching the Vimes' Boot/George Washington's Axe level, as she's commented occasionally.

Lisa's BOV isn't nearly that complex a situation, but nothing made at the moment offers enough to make the switch tempting.