On my Vector wing I measured the root thickness and the tip thickness, cut some shims that measured half the difference between those measurements, and put those shims on my bench at the tip rip locations. That takes care of holding the wing at zero dihedral.
Then when I mashed it all together the trailing edge was swept back. I put blocks in a straight line to push the trailing edge against, eyeballed the wing in place, and it looked good.
Then I measured the height of the trailing edge from the bench all along the length of it, bracing and weighing it down as needed until it was consistent.
Once I was happy with the alignment I took it he wing out, pulled the halves apart, slathered the Titebond to it, and put it back in my ‘jig’, tweaking, realigning, and measuring until I was happy with it.
When the glue dried there was a gap at the rear of the wing joint. Epoxy/Microballoons and a strip of fiberglass cloth fixed that up nicely.