Further progress...

I have eventually finished the right wing panel. Spent quite some time with the ailerons. Gluing in balsa blocks in wing and aileron, adjusting the Robart hinges plus sanding the ribs to fit the leading edge on the aileron....

The servo tray was done using 2,5mm plywood. On top of that I glued a layer of "Pro-Skin" ( thin fiberglass sheet) protruding 5mm on all 4 sides...