Today I also begun the installation of the wingtips. First I had to re-rig the ailerons and check the alignment.
Then the tips need to be cut at the trailing edge, to set the gap with the aileron. The whole contour of the tip needed to be cut back 1/16" to fit perfectly.



After drilling small holes only (they will be enlarged later for screws), I installed the trailing edge rib that I'll drill later.



I did the same operations on the roght tip but stopped short of drilling.