Installed upper fwd fuse to check for interference. Clamped cabin cover to mid side decks as required. Used spreading clamp inside baggage area to push cabin top outward toward tailcone top skin. Match drilled cabin top to tailcone skin then match drilled cabin top to fuse side skins. Match drilled fwd and aft bulkhead side channels to cabin top door frame. Match drilled fwd bulkhead side channel gussets to 1042 fwd bulkhead side channels. Transferred marks made on mid cabin decks to cabin top then drilled for #8 screws. Countersunk all screw attach holes in cabin top door openings as required.
