The rear Jig locates in the rear lifting holes. A theaded bar holds it in place.
The front Jig attaches to the main center section attachment points.
Both Jigs are anchored to the floor. There is no longitudinal bracing. This is deliberate so when you accidentally bump the tailplane it will give preventing damage. It has all ready paid off.
It is not anchored to the floor so the wing can be moved around.
I use drop strings and a laser to line everything up. This is especially usefull when lining up the flap hinges.