I drilled the rear spar and set the sweep and incidence. I used some unique fixtures to set up and check the alignment of the wings. Instead of a chalk line on the floor I used a string suspended off the floor with jack stands.Plumb bobs hanging from the leading edge of the wing. Measuring from wing tip to centerline of the fuselage at the firewall and tail. Being able to make small adjustments of the string after moving the wings to location was desirable. Measuring to a plumb bob string and a datum string made the rigging accurate.Darn it I have to drill out the piano hinge on the flap to get the location I need to the fuselage.