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Nice project. If you look around the forum, I think there might be some other good references related to this or similar Tiffies. Catch22 started an RCAF Typhoon not that long ago.
Good one. The profile with the decals probably shows the same, but here's a profile showing the aircraft in 1945, from the 'Warpaint' Typhoon book.
I also have a profile and photo of an earlier 5V-X, but not really relevant, as it's a three blade prop and a different serial number and pilot.
Yep, upper wing 'C1' roundels were introduced early in 1945 - can't remember the date offhand, but it was something like 2nd January or 2nd February.
One point to remember, which is bound to be incorrect in the kit instructions!
The upper walls of the cockpit were painted matt black, as was the front and rear of the head armour, and the decking under the canopy,not the usual Cockpit Grey Green. The latter colour was, however, used elsewhere in the cockpit, on the lower walls, which can hardly be seen, and on some of the tubular frames and fittings, and the seat. the rest of the frames, and very often the ribbed heel boards, were painted 'Aluminium' (matt silver).
Also, the reflector gun sight did not use a reflector screen, projecting the reticle directly onto the windscreen, unless the MkII Gyro gun sight was fitted, in which case the reflector screen, and the glare shield, were in place.
It's difficult to be certain, in the photo you posted, which sight is fitted, due to the reflection of the overhead camouflage net on the glass of the windscreen, but what looks like the top of the glare shield of the sight is just visible, and this would tie-in with the period, when most aircraft had this sight fitted by then.