I have added a mod to the database which I hoped others might enjoy:
http://library.galciv2.com/index.aspx?m=400It makes the tiny and small hulls hold and cost less, and the large and huge hulls hold more. I also varied the three hulls in each class so that there is a regular hull, and spacious one with more space, and a heavy frame with more hp.
My goal was to make the fighters feel very small in comparison to a battleship. In the normal game the fighters are 12 space and the Huge hulls are 80, not as much difference as i thought there should be.