Inboard skin is all riveted on in the first picture. I had a friend help me with the outboard skin.

I used the same technique to get the tank and leading edge on the spar, by first attaching them to each other, putting them in the forms and then lifting up the wing and setting it down on the combined pieces.  It works great, but remember if you do this you must attach the inboard rib of the leading edge section with different hardware than the plans because you can’t rivet them as called for.