The efficiency of an aircraft generally comes down to cross section, weight and engine efficiency. None of which would apply to that thing. The exposed cables for control add an interesting design element as well. Can someone give a basic translation of the text? Three stairways and a lot of empty space... Was this intended as a cartoonist's joke creation or did someone seriously intend to fly that monstrosity?
i believe that they are actually antenna. this a 40's design afterall.... probably long wave and short wave...
I think the cables are simply for stabilisation of the construction.
I wish Polaroid film was still affordable instead of the overpriced Impossible stuff.