Hello Willi:
Great start on the kit. As you know this was in WNW first batch. After building some of their latest releases and going back to this, the modeler can see how they (WNW) have improved the detail on their kits. I am sure if this kit came out today, the rocker arm springs would be more detailed as would the rocker arms. It makes for a fun build. With the engine sticking out like that, if you have any of the later kist, Pfalz DXII, Fokker DVII's, there are engine numbers on the decal sheets that you could use to put on the front cylinder to dress it up a bit.
Great job so far, I like your wood tones and the seat/fuel tank is looking mighty good.
Looking forward to your progress on this one.
Best
Mark