Abstract: A method for the manufacture of plastic car bodies, preferably moulded or cast in one piece, with openings for doors and windows, includes the step of forming recesses from the outside to the inside terminating inside in an approximately right angle; at least one opening is cut out by means of a projection from a flange or angle K; moulding is then secured to envelop the plastic portion and is attached to an internal rollover bracket or frame; on one side of the door opening moulding is secured a door hinge.