Painted white stripes on tail wheel assembly. Clecoed and drilled #30 L & R F-817 seat back support plates. Separated and smoothed F-856-1 spacers. Clecoed on bottom of cockpit rails. Clecoed WD-808 front seatback support in place. Match drilled all #30 holes on cockpit rails and seat back support. Drilled to #19 four holes on each side for screws. Drilled each foot of WD-808 front seatback support to #12. Drilled all #30 holes in L & R F-804N-1 bulkhead caps. Removed bulkhead caps. Drilled all nutplate attach rivet holes in F-824A-1 aft side skins. Match drilled L & R rudder stops on aft fuselage. Removed F-812 bulkhead assembly and F-828-1 aft bottom skin.