One of the mistakes I made when building the wing stand was not adding shear webs along with width of the jig. The wing stand has been fairly unstable in the that direction, so I finally decided to solve to problem. I ensured the wing stand was vertical by using ratcheting straps to pull the vertical beams to the correct orientation.
Now that the wing stand has been strengthened with the shear webs, it’s much more stable.
I removed the tank skin in preparation for reworking the Z brackets.