Tonight I sanded the inside of the L wingtip where the glass layups for the wingtip stiffeners will go, and also where the marker beacon antenna will go. Next, I cut the bottom pair of stiffeners to match the pair I already made for the top side. These stiffener dowels have their ends tapered so they lay nicely against the inside of the tip.
I also countersunk the holes for the wingtip rib attachment rivets.