The mod you linked to hasn't been updated for 2 years. There is
a remake, though, that's supposed to work with 0.17. I haven't tried it out, but from the description it seems to have no features beyond what the original mod has -- apperently, you just get a basic steamship that can be placed, but isn't minable, and that can only be driven manually. It may be worth to keep an eye on it, though; perhaps it will be developed further.
Meanwhile, I'd highly recommend
Cargo Ships, which already does provide what the OP is looking for:
Bizobinator wrote: Sat Sep 09, 2017 5:50 pm
I would loooooooooove to play an ocean game where you had to use cargo ships (freighters & tankers) to ship stuff across oceans ^_^.
Mod provides cargo ships and tankers. Tankers can be loaded at ports, but you can also send them to pick up oil from off-shore oil rigs. The mod also provides a small boat.
Bizobinator wrote: Sat Sep 09, 2017 5:50 pm
Or, even use a variety of railroad? Like, a "shipping lane" item, which is semi-visible.
The mod provides so-called waterways, which are free to produce. You can then use your ships (and the small boat) just like trains, giving them routes between ports (instead of train stations), and making the routes safely passable with signal and chain signal buoys (instead of signals and chain signals). In fact, ships and the small boat (if it's driving on waterways) are just trains in disguise. The small boat doesn't need to be put on waterways, though, it can be driven freely on water -- just like a car (which it actually is, in disguise) on land.
Bizobinator wrote: Sat Sep 09, 2017 5:50 pm
It could be spiced up with ocean and/or air enemies
This is not part of Cargo Ships, but it has an optional dependency on
CanalBuilder. That mod introduces swimming:
Swimming - Players, vehicles, and biters can cross shallow water
Thus, biters can attack your ships if they cross shallow water, so they are not entirely safe! On Cargo Ships' information page, artillery ships are mentioned under "Planned features", but apparently, the author is working on silos and cranes right now.