Hm..... I see now. I would have thought a twin fin arrangement, with the bulk of the fin area below the tailplane would have been a better solution. Although The Vultee Vengeance originally had a twin tail (as the Stuka, come to think of it) and they all quickly reverted to conventional tails. OK, another idea. Since the gun turret is a remote installation, why not put it aft of the fin. The ammo could still be stored near the cockpit to keep the bulk of the weight near the centre of the aircraft.
What role was this type designed for? Very puzzling....
Tim P
PS How was the rudder supposed to operate, then? When the fin is 'down', OK, I can see the hinge line is perpendicular to the fuselage axis. But rotate the fin up, through about 90 degrees, the hinge line is parallel with the fuselage. Ooooo, nasty........ BuzzzzzzBangNoYawControlBAILOUT!!(In German, of course)