RE: GP Extra 300S 60 Build
Build a little slow - familly responsibilities this week.
But I have managed to get a good fit on the wing joint so I will glue that this evening and post some more pics.
Went through the manual again yesterday noy reference on root rib angle but it does show using the rb guage to set the end points of the spars at the root. I measured and calculated the dihedral angle based upon the wing jigs at 2.7°. This implies that the rib guage should have an angle of 87.5° - mine does not. Would really like to hear from other GP extra builders on this one - for furure reference.