RE: Joining Large Wings
Tip to tip clamping pressure is not needed when joining wings. If there is any dihedral, it will create a bending moment in the wing and disturb the desired dihedral angle.
Just join with 30 minute epoxy and jig it on the building board to the proper dihedral angle. Check that everything is aligned correctly several times. A few strips of masking tape across the joint will hold everything in place.
Dave