Deviating from the plans!  Rather than having ugly pop rivets visible on my wingtips, I decided to epoxy the tip rib into place.  I will then add a strip of fiberglass over the flange, and onto the inside of the tip.

Whelen LED Position/Strobe light in position.

Lightweight auto parts store  universal rear view mirror
material will add efficiency to the nab/strobe lights.

Left tip nutplates are installed.

Countersinking fiberglass is not my favorite thing.

That's right, the nutplates are on the wrong side....just for drilling the rivet holes.  There are 40 something nutplates per wingtip, 3 holes per nutplate.  That's a lot of drilling and countersinking!   Dulled some tools for sure!