Match drilled all common #30 holes in rear spar attach bulkhead. Drilled and countersunk seat rib angles nutplate holes. Manufactured both F-805D brackets. Match drilled F-805D brackets to structure. Assembled both seat belt anchors. Final drilled all #30 holes on both forward L & R inboard seat rib assemblies. Match drilled aileron trim support brackets to L & R inboard seat ribls. Cut 1/8" slot on trim slide tube for servo attachment. Enlarged snap bushing for slide tube.