Cleco together skeleton. Rivet Ribs to Spar with A5 Rivets Add L8 "L" for Tank Pilot, drill and rivet L7 "L" Add 2 AN3-5A bolts to L6 Rib Attach and drill rear zee to ribs Detach and debur Attach plate to Rear Zee with A5 rivets Attach Rear Z to ribs with A4 rivets