I believe there's only one FSX-native Hellcat available, and it's the payware from Vertigo Studios.
The external model is quite nice, so is the VC.
Of course it suffers greatly from the comparison with the Accusim warbirds, but it's nice anyways.
There might be some freeware models too, but they will be in FS9 format, which means the virtual cockpit will be useless in P3D.
The situation is the same if I'm not mistaken. The only FSX-native one I know about is the Aircraft Factory (A2A) one. Sadly, even though it's from A2A, it doesn't have any Accusim extension :/
There are a few freeware Corsairs, but all in FS9 or CFS2 format, so in P3D the cockpit won't be clickable, as usual.