Thanks for the replies...
Octagons... That Feeling You Get When Things Go Awry
It was a matter of disappointment when I found the turrets were hexagonal and would not fit the upper bastion assemblies.
Ultimately I had to make my own...
https://i.imgur.com/i7Ahp5P.jpg
Fortunately I could still use the guns.
https://i.imgur.com/laagsbC.jpg
The upper works of one of the four corner bastions.
https://i.imgur.com/DapA7Uo.jpg
And some ideas of how to flesh out the basic structure..
https://i.imgur.com/lU9C8RC.jpg
https://i.imgur.com/ntsTWdO.jpg
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