Good start Igor. It might be worthwhile sanding down the rib tapes on the rudder slightly. Although they are visible close up, or on a light-coloured scheme, they aren't very prominent, being fabric tape with a 'pinked' edge, doped over the ribs.
As you can see on the Dutch Spit with a white rudder, they are visible, but not raised, as the light catches the surface. But on the Polish Squadron MkV, they can hardly be seen at all.