Many thanks, Justin, for your time and this extensive information.
Looking at the photos of completed Bugan's model in WNW site I indeed noticed the "fattish" look of engine control rods. The rib tapes - interesting, now I see it, too. But in the info on the kit, WNW clearly state 'Fine in scale rib tape detail', as usually in their kits descriptions. I hope they did their homework here, as we grew to expect from them.
And yes, it is that light grey plastic making the "softish" impression that stroke me so much in Ha;berstadt sprues. Let us hope it disappeares when elements are assembled and painted - both, here and on Halberstadt.
Once more - many thanks. I hope to have my Gotha in 2 weeks, however the post tracking system still does not see my parcel...