By the time I get steam I normally control my own continent, so rather than build ironclads, I just convert the sailing ships on seafood sentry duty.
The paddle steamers fill another gap.
Your mod is an elegant argument that one can improve both gameplay and historical realism at the same time.
Well, you certainly have the option of building various sea-worthy ironclads and pre-dreadnoughts in the industrial era that you would have otherwise been forced to choose between wood and sail ships or coastal ironclads in my mod.
I don't know why, but there seems to be some people that are obsessed with the thought that you always have to sacrifice realism for gameplay and that it's impossible to do both at the same time... certainly there are cases where one has to give-in to the other, but it's never
always the case, and shouldn't be in this aspect of coal-fired navies either... Firaxis left plenty of room, both in strength points and in available techs to reasonably cover the coal fired naval age... they just left it completely empty!
My main point (besides adding some realism and more in-game options) was so that an industrial age power (whether it be AI or Human) who has a tech lead over the other civs could also rule the waves with ocean going ironclads over canvas and wood sailing ships... without this mod (or something like it), even if a civ holds a clear technological advantage, it cannot enforce it on the waves, because in default Civ4, everybody has frigates and SotL
forever, until (magically), WWII Destroyers show up on the scene. This allows an industrial power to outmatch his opponents at sea with ocean going ironclads... and if they catch up to him on that, he can step it up to pre-dreadnoughts, and yet again, to full-fledged dreadnoughts... in other words, you can have naval arms races in the industrial age, just like happened in real life... and it all works very well with the game system of Civ4... default WWII destroyers and battleships are still going to trump all these older ships, but these new industrial age ships trump the sailing ships before them and each other.
Anyways, I was very happy with how the system turned-out and how it fits in-game... any of my negative comments are from those that have never actually tried the mod, just read about it... as everyone who has played the mod all comment how well the naval system works, how it blends seamlessly into the game, and how well the AI takes advantage of the new units as well as the human can/will.
In a worst case scenario... if you don't need the ships, or find yourself moving through the tech tree so fast your head is spinning, then it's no different then playing default civ4... you can still jump magically from frigates to destroyers if you so desire at the same points in the tech tree... just don't expect the AI to completely ignore industrial age navies if you choose to do so!