Good stuff Bob. Bit late now, but for future reference, the interior was bare aluminium, with fittings painted matt silver, in those areas not occupied by crew. Crew areas were standard Cockpit Grey/Green. Seat cushions were medium green, with those aircraft built by the London Passenger Transport Group having the blue green seat cover material used on the London 'Tube' trains of the period.
The Airfix kit is the Halifax MkIII, the radial engined version, with the longer wing span.