Yeah, Kirin already owns the car. Theres no letting it go.
Anyways, yeah since you had to purchase a motor from a seperate car, this car is very easily registerable as a U-Built with a BC Assigned vin. not really a big deal, all you have is a second vin tag on your A or B jamb. You keep the original vin on the car, for I.D./ service and parts situations. Then you just have paper work for the Second vin number and all is well.
You would go through that process when the car is complete. Kind of like if you built a trailer or camper yourself and had to insure that.