Assembled all left wing ribs to the left main spar. A little confusing at first because some ribs are left and some are right on the same wing. But it now makes sense. Then I added the left rear spar to the assembly. Match drill all the rib to spar rivet holes to #30 and deburr holes. Note the brown stick supporting the center of the spar. At least for now, this removes the sagging downward of the assembly. I have a laser level on a tripod and used it to confirm that the main spar is very straight and true. The adjustable supports insure that the spar has no twist.
