Deburred all pieces to both seat backs. Riveted together both seat backs. Installed wire in hinges to seat back and brace plate. Began work on forward covers. Deburred 982E acces plate, drilled and installed all platenuts. Deburred F982 heat baffle, drilled to F981C (982C?) and riveted together. Located and drilled holes in F981C (982C?) to floor angles. Installed nutplates on 981C.