Abstract: A method for producing a large outer paneling part for a movable body part of a motor vehicle such as a door, a front hood, or a tailgate may involve using a forming die to form a large metallic panel part into formed panel part having a three-dimensional shape. A reinforcement made of plastic may be applied to at least a portion of an inside of the formed panel part by back injection molding. In some cases, the metallic panel has a sheet metal thickness of less than 0.6 mm, and in some cases less than 0.5 mm. The formed panel part provided with the at least one plastic reinforcement may be connected to an inner structure produced from metal sheet and/or plastic by folding and/or adhesive bonding the plastic reinforcement.