Thanks everyone! Here's where I am at now. I made up a gunsight:

And added some more paint.






This was my first time using Alclad Chrome, and it was, well, ok. Not as nice as I thought, but ok. Came out more speckly than I would have liked. Probably my own fault somewhere as I hear that chrome in particular is especially tricky, even with a gloss black undercoat. In retrospect, it probably is reasonably 'scale', as the aircraft were not spit-polished all of the time. There's plenty of photos of RAAF machines with the metal panels tarnished. There's enough of a difference between these panels and the 'fabric', so it'll do (and I don't want to go back and try it again!).
I still need to add the decals, which in the case of RAAF machines is a simple small-sized black serial number on the fuselage. Exciting. I'll add this closer to the finish line (as I still have some handling to go to mount the upper wing and rig the beastie).
All comments, tips and feedback welcomed.
Cheers,
BC