Finishing off the basic sight enclosure, I've made the sight head for the gunner's sight, which, as 064 was fitted with the ranging machine gun, was a Sight, Periscopic, AFV, No 40, Mk 1 with x6 magnification and a x1 window and ballistic graticule pattern:

The rest was straightforward:




Now for the sight hood and wiper.
Thanks for looking.
Stephen