[Hotfoot]

Nice, so far it looks good from what I can see. A few minor criticisms, however:

1. Frigates can now become harder to hit than a small fighter (or just as hard to hit), and harder to hit than a large fighter. Somehow, that just doesn't seem quite right.
2. There are no more 2000+ kiloton chassis, as you've modded the Starbase to be only 1500 kt. This means that the components needed to make ringworlds and sphereworlds can't be used, as nothing is big enough to handle them. I don't know if this was intentional or not, but it would be nice to know. If you changed the size of those components to fit on your current starbases, that would mean that baseships could be fitted with them as well, so planetary shipyards could be used to make the components which could drastically alter the way ringworlds and sphereworlds are created.

I like the idea though. It could add a lot more specialization to the game, as well as give new uses to the smaller capital ships.

-Hotfoot
"Now, what about minaturized weapons?"