Nice. Gotta' be a story behind the wings and the markings.
As for the wings, it comes down to the fact that manufacture of sub-assemblies was outsourced to many contractors. Parts needed to built and shipped out as fast as possible and I also expect that scarcity of the standard RLM 65 (light blue) paint played as part as well. Save time and material by only painting the outer panels.
As for the marking, I can only assume that the aircraft came from another Staffel in the Gruppe, so the previous "2" was probably the wrong color for 11 Staffel planes, so it was over painted and replaced with "yellow 1"