I built most of a turbulent once upon a time and I have flown one. delightful little aeroplane.
with my fuselage almost complete I sat in it on the bench and to my eternal frustration found I couldn't fit in the cockpit
it took ages to find out what size roger druine was.
closest I came was a photo of him and henri mignet together. they were about the same size.
in henri's plans for the HM293 he mentions a flying weight for the pilot of 65kg.
this accords with a pilot of about 5ft tall and slim build.
I was well underway with a second fuselage that had the seat 2 inces back when I was told that the turbulent I had flown already had this mod.
I eventually gave the entire project to a short guy to complete.
overall an interesting but very frustrating little aeroplane.