With regard to a mold. Home Depot & Lowes sell 1/4" thick blue foam insulation in folded sheets. Wrap that around your nose ribs, cover with plastic film and lay your fiberglass over the plastic. The fiberglass should cure to a shape that should easily conform to the nose ribs, once the blue foam is removed. Another method would be using cheap, super thin, aluminum roof flashing over your nose ribs. Cover with plastic film and apply fiberglass. This method would make the fiberglass leading edge conform perfectly to your nose ribs. Anybody wanting to do this should research for epoxy resins that withstand high temperatures. It would be a "Bad Day At Blackrock" to see your leading edges start to sag on a 100° day while sitting on a blacktop ramp. I think some epoxy is affordable that withstands 250°F.