One thing I've found in about 6 hours of play is this: Other than once or twice, I hardly ever saw a reference to what techs were required for the "core" ships. I like the idea of being able to create my own ships, and did that last night so I could have a chance against the Drengin in the campaign (second scenario).
But I would llike to see some kind of screen in either the Shipyard or the Tech Tree/Research window that would show the list of core ships and the required tech. This would let a warmonger focus on the techs required for "core" ships.
I've also not remember seeing any notifications when new core ships were available. For example, I looked at the shipyard, and found that the Battle Axe was now available.