There was no link to the A or B and the turret. It was the same turret as the B-29, control system too, so it was a supply deal.
My F-I-Law's P-61 had the turret. He was the crew chief, but since he owned the airplane and the pilots came and went, he and the RO were the only two who had been together since the beginning.
His original pilot was given a P-47 and died in a landing accident.
He flew in the gunner seat a couple of times.
The ferry tank as far as I know was used in the original deployments to Samoa and Saipan.
In Europe, they came over on ships and only at the very end of 1944.
It's a heck of an airplane. Mostly it was used as a low level attack bomber, like a Mitchell or an A-10.
Come in fast and chew up the target with concentrated cannon fire and explosive munitions.
The four cannons had ammunition towers in the fuselage, say 18" square and four feet tall, so that you could not go fore and aft from the front to the back. Like a B-25.
That was different for them. They'd had Beaufighters wheer all three crew could trade around on a eight hour mission. Fly the plane, nap on the deck, watch the radar scope.
Great model. I have two but I don't know if I'll ever build them. My daughter and I put together the Monogram one for him, and a Beau, and they were on his mantle .