Combat Models ship and submarine kits are really rough. Because of the deep draws required for the vacuforming the plastic is real thin in places. In others it is really thick. You must brace the heck out of the hull for any kind of dimensional stability. You must lay-in a sufficient supply of Evergreen to augment the build. You're gonna need a slew of references and plans to scratchbuild the superstructure & deck fittings. Then there are the weapons ...
I have seen more Combat Models ship kits disposed of on eBay than I've ever seen completed.
Combat Models ships & subs are not for the beginner or even and intermediate modeler. I would call them suitable for an advanced craftsman with sufficient time and resources. You may be better suited in getting a R/C scale hull and working with that. The fiberglass would at least be dimensionally stable.