One thing that is absolutely certain on almost all of these early aircraft is that the wing to fuselage joints should not be seamless. They were built as separate items from the fuselage, not as a one-piece unit as on later aircraft, and could be removed for transport. There may very well have been a gap, there was on many of this aircraft's contemporaries. I built my 1:72 one with the wings fitted close but not filled and faired in.
HTH.
Ian