In this session, I worked on riveting the J-channel stiffener onto the back side of upper skins of the left wing. This stiffener comes in two pieces that are flush riveted, and have an overlapping area of a couple of inches near where the two skins also overlap.
I found it easiest to keep the wing on its edge (main spar sitting on the tape surface, with the trailing edge facing up) and then use a step-stool to stand above the wing with one hand riveting or bucking from opposite sides. This work went relatively easily, with only one minor problem when my bucking bar slipped during riveting and left a slight dent in the interior side of the J-channel. I consulted with Vans and they indicated that since the J-channel is not structural and only serves to reduce oil-canning effects, there was no need to do anything to address this minor damage. So with that I carried on and finished riveting the entire J-channel in place.
What's next? There are 7 screw holes in the inboard edge that need countersinking, and then I can move onto finishing the trailing edges of the flaps and ailerons.