The wing jig assembly was a bit of a challenge. It was originally installed on a garage floor that sloped (as all garage floors do). My shop floor is not sloped. This made it a bit tricky to assemble since the wing skin templates were bondo'd in place on the jig. I started by supporting the wing above the jig on two stands I built around the jig base. Next I leveled the jig as best possible. When I felt is was pretty close I removed the bondo from the underside of the wing and lowered it back onto the jig. I was pretty frustrated at this point when the wing appeared to be twisted. I later found out that this was due to operator error (mine). The last photo is the water level I built using a waste basket and 25' of 3/8" vinyl hose. I place the bucket of water on the bench near the center of the wing. Then I move from point to point and measure from "X" to the water line.