The individual who constructed the airframe from raw materials or from prefabricated components as found in a kit such as fiberglass formed skin components, foam cores, canopy or plastic molded exterior details, wheels, etc. The same individual, with material of his or her choosing, shall also perform all final assembly and finishing (painting) of the model. Any other commercially advertised products may also be used without penalty to the modeler at the various stages of construction. Hardware independent of airframe (visible or not) requiring machining or welding to assure reliability, safety or the required operations of the scale model aircraft such as radio, engine accessories and, undercarriage gear commercially acquired or designed by the modeler for optimum outline accuracy, may be commissioned independently when in the judgment of the modeler commercially available items are not adequate. No other airframe construction may be commissioned in this manner.