This is one of the most critical times in Coot assembly, when the wing trusses are hanging onto the ends of the 96 and 127 bulkheads, acting as jigs for glassing the latter into the hull permanently. The photo was taken before 1974, when Molt, on Professor Avery's good advice, insisted that all diagonal wing ribs must have vertical stiffeners glued onto the ribs between every lightening hole.