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"Kalinin K-7 (Russian: Калинин К-7) was a heavy experimental aircraft designed and tested in the Soviet Union in the early 1930s. K-7 was of unusual configuration with twin booms and large underwing pods housing fixed landing gear and machine gun turrets. In the passenger version, seats were arranged inside the 2.3 meter (7 ft 7 in) thick wings. The airframe was welded from KhMA chrome-molybdenum steel. The original design called for six engines in the wing leading edge but when the projected loaded weight was exceeded, the seventh engine was added in the trailing edge of the central pod.[1]

K-7 first flew on 11 August 1933. Then on 21 November 1933 the aircraft crashed due to structural failure of one of the tail booms, killing 14 people aboard and one on the ground. Although two more prototypes were ordered in 1933, the project was canceled in 1935 before they could be completed."

http://en.wikipedia.org/wiki/Kalinin_K-7

for better "real" pics...and if you can read Russian (Scroll down for a lot of pics)

http://mkmagazin.almanacwhf.ru/avia/k_7.htm

more renderings on what i believe is the original artists web page
http://www.rusring.net/~levin/levin3d/2.htm and the direct link to his page with the plane http://www.rusring.net/~levin/k7/k777.htm