Slight thread drift here, but does anyone have any thoughts as to how the rudder and elevator linkages might have been arranged on the Zwilling, given that it was presumably flown by a pilot whose controls would normally operate the surfaces on the fuselage he was sitting in. I doubt if fly-by-wire was in use in 1943. Come to think of it, the same query arises with the twin Zlin and Ercoupe. Cranks and pulleys across the joining wing would present a lot of frictional losses.