I flew on C-23B... B+, and C’s. They were a merger of a 360 and 330. I forget which civilian model had the twin tail, but they chopped it off and switched it to the better /newer airframe. Had a large ramp door, and two side doors in the back. Doors swung in, so we could open in flight to drop paratroops. Rampdoor swung both ways. There was a large cargo door on the front left, and two window hatches in the front. Maybe they did open like you said. I gotta look at my old pics.. its been 18 years.
Im supprised that door didnt rip off and take out an engine or something!
The Shorts 330 had the twin tail!!!