I think you are quite right to include form of commercial
element in your planning
Personally I would restrict your living quarters to the upper deck(s), can have all the luxury you want
.....but elsewhere can be more functional (both to save costs and increase commercial
I am sure folk have heard the old saying that money
to be made by being "in the right place at the right time"
....well, there is more money
to be made by being "in the wrong place at the right time"
.....on that note I would suggest a capacity to carry passengers (both 1st class and steerage class as well as some cargo capacity - could be a crossover between those two latter categories
)....also being able to provide medical
facilities onboard (or at least offload some, plus relief supplies) would make appearance in difficult places reasonable, even if not the primary purpose of the visit.........some people do like to leave places quickly, and with much luggage - some of which can be rather heavy. Some of these folks are willing to pay (in advance) for such an option to be maintained - even if as only a plan C, which is hoped never to be used.
Weapons wise, IMO very wise to have some
....apart from small arms I would suggest that rather than having anything permanently installed that instead you only add the capacity to do so by creating firing positions. Obviously a trade
off on what firepower you can have but as you won't be tackling any navies head
on (hopefully not anyway!) then IMO really only need range and a hail of firepower rather than purely destructive force. In most circumstances if you can launch a helicopter with simply a door gunner then that will deter most of those in the private sector. The idea is that weaponary can be loaded and unloaded depending on where you are in the world and the expected challenges- and with a helicopter pad can fly in stuff when safely offshore
In practice if operating in more challenging waters then the most useful protection one can have is at least a "Nod and a wink" from officialdom, onshore and / or afloat (officialdom tends to be better armed
- anyone else is fair game
). Plenty of money to be made in the "Nod and a wink" sector
....and if that occassionally moves a tad towards the more freemarket end of the spectrum, well that just how life is