Looking at the way the interior shots were filmed I’m thinking there must have been at least two nose/cockpit sections used for the filming, or at least one rig that could be broken down into sections? For filming the crew face-on they would surely have had to have a section with nose and windscreen removed, then there were the side and forward facing shots that included the windscreens and instrument panels etc and there were the nose shots from the BA’s position which would have been difficult to shoot with the cockpit in place.