Note that this particular aircraft was fitted with a smoke-producing unit in the tail which at first was thought to be a flamethrower !
It's purpose was to lay a heavy smoke trail, either as a screen, or to deceive attacking fighters, and the main part, the projecting tube, was mounted externally, and can be seen in the second pic posted by Wojtek in Post # 129 above.
The 'tube' extends just past the tail-planes, and feed pipe appears to run the length of the fuselage.