The 100mm gun space

Ah well, on my original plans I had overlook some big bubble on the top of the hull which is the place where one 100mm gun (5 inches?) gun was fixed. So well, here i vacuformed the place using a light bulb of the right dimensions!
Now will I make the gun itself?
Well no.
Simply because there is no reference at all findable!! I have been asking in french forums but they proved to be an almost desert. I can't believe the amount of stuff I have on pre 1917 russian stuff compare to the scarcity of the french stuff.
Curse the French.