Square up with where you are at and then don't spend another dime on it until you have a new contract with writing with the new owner of the vehicle. When ownership of the vehicle changes then everything changes. Color, stance, interior, etc. are all up for change. The new owner might not even like the car. If someone left me a 4 door Studebaker in their will I wouldn't be very pleased. Especially if it was at a shop and the the shop was spending money on it. I'd want that stopped asap.