Lovely AAR; I appreciate the theme especially as a huge sea nerd. As I was reading through it, a couple things struck me that I'd like to ask questions about.
First, why is there a Death Star icon in Sol? Is this because Sol is the capital of the empire and you're using the Star Wars theme? I don't think I've noticed capital marking before, if so, though possibly I just missed an option somewhere.
Second, did you tweak the homeworld mineral generation algorithm? Earth looks pretty rich to my eyes. If not, I guess you just got lucky, or my estimate's out of whack.
Third, is system gen more likely to give 2.00 colony cost worlds now? Seems like you have a lot of them, when usually, especially with Real Stars, they're somewhat rare. I know you basically redid how habitability and terraforming work, so maybe a side effect is to make candidates more common?
Finally, a proposal: First Naval Lord I take to be a translation to space of First Sea Lord; I propose instead First Space Lord to keep the sibilance and the syllables.