Having decided upon 1/1500 as the scale of choice, let's look at a couple of examples. As you can see in the top photo, the WTJ Rapid Prototype processed ships are cast in a semi-transparent plastic. Of course they have no top masts, but they either already have existing holes ready for simple installation, and if not, the larger size makes them robust enough for drilling without fear of ruining anything. They do not come with secondary (or tertiary) casemate guns, a sensible design choice given the chances of breakage while prepping the hull. You can drill holes and install these guns if so desired.
First up, the an Iowa class battleship for my Federation (quasi-US) navy. I installed the mast and one more fighting top. I don't do spars, but no reason you couldn't.
And the Borodino for my surrogate "Russian" navy. Installed masts with fighting tops.
Kudos to WTJ for a job well done on these ships.