Rivetting the right side skin to the fuselage frames and bulkheads, not so much the quantity of rivets as to the variation in size and type, mixture of flush and standard rivets, AN3's and AN4's plus having to leave certain ones out so it was a slow careful process of workig through the rivet plan. The other side will be easier. The closeup of the flap attachment bracket area is a good example of rivets left out until later in process.