Yes, I spent fruitless hours last night in the cellars, searching for my references, and couldn't find them; still I did enjoy dusting off some long forgotten projects still waiting to see the light of day. But I've just looked again on one of my sticks and there they were:
I would expect that the Oto 127mm gun would be used, or a comparable US mount; but as yet I haven't had achance to rework this so its free if you want to take it on.
BTW, moved to Sources and Reference drawings as where this should be