I doubt that during the Soviet era such photos could circulate freely because of fear of the theft of technology or industrial espionage. Nick Nilov, a photographer, was one lucky Soviet guy who was allowed to take various photos of the Soviet plane building industry because
... he was a designated photographer for the IL Airplanes - one of the largest Soviet airplane builders. Here he shares some rare photos he could take during various stages of the Soviet plane building process. Photos can be clicked on for larger images.