Senrak, thanks for your advice.

Well, I finally got around to taking the pictures of the aileron control horns. You can see them below.

I've also glued on the wingtips. You can see that the wingtip blocks require a lot of trimming and shaping. The first thing I did was carve them down quite a bit so I didn't have to do so much sanding. Then, I sanded the top and bottom of the block to make it even with the surface of the wing using 60 grit sandpaper. I used really course stuff since there was so much sanding to do. I'll use a finer grit later to make it nice and smooth. Next, I extended the contour of the ribs along the leading edge. That's where I'm at now. My next step will be to round off the front-most portion of the leading edge.