I joined the fuselage sides. First I epoxied bulkhead # 2 and let it dry. Then I installed the rear 1/4" sq. balsa cross bracing, bulkhead # 3 and joined the fuselage rear. Next I installed the cross brace by the lower wing sadle and added a few temporary 1/4" sq. cross braces to help keep everything square. Then I installed the firewall and nose block.