The old H-9 J-3 was a "small 1/4 scale" @100" wingspan. I have one also. The windshield can be fabricated out of flat stock as it isn't a molded canopy. Use thin tagboard to make a pattern to trace onto the clear plastic after you have a good fitting example. Several tries may be needed to get a good fitting cardboard pattern but it can be done. For the cowl, Fiberglass Specialties offers one for the H-9 100" J-3 Cub. Their cowls are unfinished just out of the mold and require some sanding, pin hole filling, priming, more sanding, and finish paint. I have used some of their cowls and they fit well and are not difficult to finish up. I have a new old stock spare cowl but I am not willing to part with it, sorry.