Belated answer, 5 years later, sorry... (the search tool did not find another answer it seems). In the Trait d'Union magazine #135 Jan-Feb 1991 is this (I translate, no picture): "in 1937, Paul Aubert presented several projects to the STAé including the PA 60, a figther with 2 seats side by side, twin-boom, tandem-twin-engine, each engine driving a propeller; the first as tractor and the second as pusher rotating between booms, somehow like in a Fokker D-23"hesham said:Dear Tophe,
do you have any informations or drawing to Aubert PA-60 twin boom
light aircraft ?.