It's just a shadow on the shiny surface of the tail, that appears odd because the two surfaces slope downwards towards the fuselage. If you look at the drawing on the Wikipedia site, it eventually make sense. The shadow on the starboard wing just adds to the confusion because the wing slopes downwards.
I think finished its life in kit form. There seems to have been a few unlandable aircraft made by the Krauts during WWI.
The tail on the Beverley has a serious amount of dihedral, hence the strange shadow.
The Russian Kalinin.
I'm thinking of this Reisenflugzeug. It was impossible to land due to the pilot having no idea where the wheels were relative to the ground, wheels that actually belonged on a train.
The bulk wasn't helped by having the engines in the fuselage, something the Germans seemed to be fond of.
On the plus side, those wheels look to be of an appropriate size.
I think they initially imagined the glamour, the status and the girls when they went for pilot training. Then found themselves cooking their bollocks in that contraption and realising death or injury was inevitable later that day.
