It was relatively easy to align the center section ribs. They are all the same size and are in line with each other. Not so for the outside wing panel. Each of the outside wing panel ribs is smaller then it's inboard neighbor. There is also a small sweep back on the wing. I first set the outside rib, then used string (poor man's laser) to set the sweep angle. A plum bob moved up and down the length of the string helped position each of the ribs. String on the leading and trailing edges helped to define the position of each rib and defined level for them all.

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