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Nice start Steph.
Just one minor point - the 20mm ammunition tanks included on the kit floor were as fitted to the later MkVI. The MkI used 60 round drum magazines, loaded through apertures in the floor, with spares stored on racks in the fuselage. It was the Observer/radar operator's job to change magazines, a very difficult task, in the dark, under 'g' loading, with the heavy mags.
However, even with the armour doors open, and the rear, upper hatch open, it's very difficult to see down the fuselage to view the tanks or drums, so they could be left as is.
I'm a mine of useless information Vic !!