From experience start your repairs from the back of the car. If you are replacing the rear wings do that first, align the boot lid to the rear wing the set the door to the rear wing then mount your front fenders. My car was "Restored" in 1980 and they did it all wrong. The front fenders were done first then the doors and by the time they got to the back of the car the boot lid overhung the fenders, the rear door gaps were off so far they had to add 1/4"(8mm) of filler in the door jamb to get it close. I had tp re-do everything they did.