As someone mentioned, the car won’t have a VIN so it won’t be able to registered or insured in most developed countries. What people do is borrow a VIN from an existing car, which isn’t really legal, but could be passable in day to day driving. That’s why there’s R34 GTRs in North America registered as 240SXs or Altimas, or so the stories go.
I’ve done this so many times at school and work. It’s crazy what you can accomplish by leaving a problem until the morning.