I riveted the ribs into the wing tips. I'll have to do a little research and see if builders fiberglass in the ends or just leave them open against the ailerons.
There's an internal rib that runs perpendicular to the edge and spans the wing tip to stiffen it. I bent and fluted the flanges to make them match the angle of the tip. I have a feeling that the tip fiberglass is going to get dips in it when I rivet the rib in though. The flanges of the rib just aren't perfect enough of a match to keep that from happening. I spent a lot of time trying to get the flange angles right, but decided fixing an uneven fiberglass surface with a little micro/filler would be easier than trying to make everything match so perfectly that there are no surface blemishes.
The hardest part of all of this was finding a way to translate the rib location to the outside of the wing tip so I could lay out the rivet line. The instructions say to just use a bright light to help create a shadow of the rib, but that must be from back in the days before they supplied the fiberglass with the grey gel coat. I tried every light I had and couldn't see a thing. What ended up working pretty well was using a couple of strong magnets positioned against the rib flange on the inside and then matched up with magnets on the outside. These rare earth magnets are borderline scary to use! It's amazing how strong they are.
