With help from Les Bourne, I attached and aligned jig fixture brackets, mounted the VS skeleton, clecoed the skin to the skeleton, and aligned them with each other. We added a pair of wooden clothespin clamps and some shims. There is a slight overhang of the top rib outside of the skin -- I don't think it will be a factor.
Les fastens the fixture brackets to the horizontal crosspiece.
The skeleton is mounted and the skin clamped in place.