The idea of a ship being "constructed" in such an elaborate manner is...extremely intriguing, and shows a lot of forward thinking in terms of "engineering" a ship from a Shipbucket drawing.
1.) I like the first version better with the mast - that said, aside from looking even more like a brain tumor than the setup of Fridwhatever Norweiganship, it looks incredibly unstable. Why not just redraw that?
shall make a second version. but thanks for the name idea! HNoMS "BRAIN TUMOR"
2.) I feel having two OTO 76s placed the way you have them makes it rather redundant. The ROF of that gun means that you only need one per arc to engage sea and air/seaskimming targets.
"installing cat!" Yes fully agree with that.