Thanks for the pointer AM. That image is very useful, but I’d like to see the turret from the opposite direction, showing the details on that side.
I’m building the Italeri Stirling Mk.I, which is light years ahead of the venerable 1966 Airfix kit, but could do with some extra bits and bobs in all three turrets. Here’s what I’ve managed to do with the tail turret, with the scratch-built bits in white:

Regards
Simon