Before the servo installation and the wing-mounting, I will quickly draw the wing tips.

The 3-view is not very clear in this area.  However, photos of the Fokker Dr 1 show EXACTLY the same wing tip as the O-Maskine. We can therfore assume that these two machines use the same internal structure. Obviously the Fokker wing shown in the pencil sketch differs from the O-Maskine in the spar and leading edge plywood construction, but the wing-tip must be the same.

It’s very difficult to cover this type of wing-tip with canvas, particularly at the trailing edge. The sketch of the Fokker triplane also shows how Fokker fixed this problem.

Obviously we only care about the external shape of the wing-tip, so we don’t need exactly the same structure. Here is what I have come up with.