I think first and last one look best, with parts from new necron carrier. Maybe "super weapon-platform" could have some titan perks like increased boarding range.
Is it possible to "bake" different abilities into ships? Like for example necron battleship with tyranid psychic scream. And 2 usual skills that player can choose.
To explain, macros are shotting at a specific point that will hit the target taking in account the movement of the target. So if you change direction or speed a succeeded shot can still miss.
Also for big ships, if a shot is "failed" it means that he don t hit the point targetted but depending of the dispersion you can still another point of the hull and still deals damages (not sure if the explanation is clear)
Basically "accuracy" is a stat that defines chance of shot being aimed correctly. High accuracy = good aim. But enemy movement, celestial objects, wrecks can reduce amount of shots that actually hit.
I exited (and quicksaved) campaign while it was in "moving enemy fleets around" stage, and now game when loading that save (beta branch).
Save folder and crash logs down below.