Kev I would think that the A/C wouldn't have flown with those covers off and the frontal view shows part of the wing leading edge missing, not bent and twisted but missing so someone has come along and removed it and with the growth being roughly the same it had to be before the divers got there, ergo if it was a P47 up to 8, 50 caliber mg's and the other possibility is one of the Cat series of naval a/c which I think it is because of the 3 bladed prop , 6, 50 caliber also as a quick glance there are other panels off that look like they had been removed a while ago again because of marine growth. And yeah Lar's it is #$%*ty some people can't let the poor bastards alone.
Bill the demon.