Thank you, gentlemen.
Buzby, yes, I have found one photo in WD where the front cockpit is shown and there is a linkage running along the starboard wall at the height fitting the level of the lever in the rear cockpit. So I assumed this was that missing linkage from the rear cockpit. Duly added to the model.
And some more progress.
Hinged Gaspatch turnbuckles prepared - 6 small ones for the control surfaces at the tail and 22 large ones for the interplane and undercarriage rigging.
And a small proof, that WNW's, rightly called the best model kits in the world, are not perfect in all aspects. Here I found three places calling for significant filling, levelling unpleasant steps and sanding - underside of the top wing joint between the centre piece and outer wing panels as well as two spots under the fuselage.
I am showing this not to complain but to indicate, that contrary to some opinions I heard recently that these kits are shake-and-bake, they are not so. And they surely leave some space for amendments, corrections, etc. In many cases the photos on the instruction booklets show that the kit parts are missing some detail.