Karnack the F4f-4 and FM1 were essentially the same with one big difference, the horse power. I think the F4F-3 fixed wing would be a great addition to the game.
The article I posted in post number 36 gives a lot of info about the wildcats.
I think its also note worthy that the F3F was the first US built ac to claim a air to air victory in WW 2, over Scapa Flow in 1940 as a Martlet MK 1. It shot a ju88 down.