I saw you ask the question on how to edit the back of the car with the blueprint if all the wires look the same because you can see the front. Usually when building a vehicle you have to do it in separate pieces, the hood, the roof, the windows, the bumpers, the fenders, trunk... if you separate all of your geometry you can then hide what isn't being worked on at the moment and then bring it back when you want to work on it some more.