Information from William Reece, whom is very knowledgeable on US aircraft interiors,
F6F-3 Hellcat. Cockpit: The first 100 F6F-3s almost certainly had Bronze Green cockpit interiors. The rest had FS 34151 cockpits. The engine cowling and the fuselage interior including the area behind the cockpit where the small windows are located was Light Gray FS 36440 (Grumman Gray). Remember on all of these a/c the general rule is that the wheel bays, landing gear struts, wheel centers, landing flap bays, etc. are the under surface color. The area ahead of the rear main spar in the wheel bay was interior green. This area was unmasked and so may have had some significant white over spray. Interior Green should be the dominant color.