In case the artificial gravity failed (or there is none to begin with), it would be better if the biodomes where turned upside down. That way you could generate gravity by rotating the ship around it's axis. ...that would of course look a little bit silly. Great work, I will look out for the game!
Oh nice. I like the feel of "transport" here - with all the modules and rings on them. They have a distinct "We don't fight" feel to them, and yet still feel like part of the cohesive fleet design you've got going.