[Christ]

It's a DMV thing. If you ask the DMV in your state, they'll probably tell you something along the lines of either filing for a vehicle VIN/Title after production (similar to how you would file for a trailer in some states, pictures, forms, etc.), or, in the case that it was constructed from other vehicle parts, you'd use the VIN's of those other vehicles and fill out a SV title. (Specialty Vehicle)