$15 is pretty cheap for AM, especially for ships.
For some kits, the full suite of AM is way more than the cost of the kit.
And, you have to read reviews of the AM (or kit builds using them) to know what you are getting. AM does not necessarily mean "more accurate." Also, AM does not necessarily mean "less effort."
Turned brass or aluminum barrels have advantages, no seams to sand, and they are never oval in section. However, they almost always have some sort of muzzle turned into them. Which is nice, but naval rifles 3" and larger all had tompions in the muzzles.
You want sticker shock, price out changing a Tamiya Fletcher to a Bath or Bethlehem built "square bridge." You're looking at $25 for the bridge alone. Turrets will be about $18 from Shapeways, or 7euro each from l'Arsenal. Probably a $30-40 hit for photoetch on top of all that. Or, you can get plastic card, putty, saws, shanding blocks, etc., out and do it yourself.
Or, you just build OOB and call it even. Your model, your choice.