Hi Francis, I think the point you make about replicating the FlyHawk detail on any 'new' parts is highly valid.
From my own perspective, the task required to lower the deck level upon which 'Q' turret was sited, as well as maintaining the level of details, is beyond my own meagre skills, so this entire idea might have to remain just a fanciful dream.
However, thank you for mentioning the Ensign book, of which I have a copy but had forgotten all about in my obsession with the 'Improved' Dido group.
Having dug it out, it reminded me that some examples in the earlier groups of these vessels didn't ultimately have, or end up with, a 5.25 mounting in the 'Q' position.
HMS Phoebe had a quadruple 40mm installation in 1942.
In 1943, HMS Cleopatra also had a quadruple 40mm fitted in that same position and, in addition, had the 4 barrel 2pdr pompoms in the waist position, replaced by quadruple 40mm weapons as well.
Finally, there's a lovely photo of HMS Argonaut in 1946, with a 4 barrelled 2pdr pompom fitted on a more elaborate 'bandstand' in the 'Q' position, which was carried out in 1944.
In the latter three cases the only alterations are to the weaponry, rather than to any of the ship' structures, so these are obviously a more attractive option to consider (I'm favouring HMS Cleopatra).
I must say, the centrefold illustration of HMS Black Prince, in the Ensign book, is superb. I'm almost tempted to fit it in a picture frame and hang it on my wall.
Thank you, once again, Francis for your kind thoughts; they turned out to be very useful indeed
DaveW