I have now started some research on my next project which is Castello Argonese also known as Castel san Angelo.
Fortunately Brigade models do an almost correct model of the fort, but as my research brought to light there is a bit missing from the model which was still extant in the late 17 and early 18 hundreds.
https://sailsofglory.org/attachment....id=58383&stc=1
Here is the actual castle as it looks today.