I've been doing some more tweeking of my fleet and base tactics and thought I might share.
For star bases since there's generally no theme to them this gives me a wide range of use. As of right now I've been using them as military exclusive construction yards and command bases. I've also included troops and fighters into the design to help replenish fleet units or to support any worlds that come under attack.
As far as my fleets go there are some technologies that I must take into account: cloaks, area weapons, ion weapons, gravity weapons, remote shield rechargers. I plan on each ship specializing in an area, most likely as a "special feature" rather than simply replacing a weapons system. I'm still tweeking what a 15 ship fleet would compose of, but I have two configurations down for my 10 ship fleet. Carriers will act as the lead ships in my fleets. All fleet designs are around the theme of general purpose, multi role functionality:
Type 1: 4 curisers 3 capital ships, 1 carrier, 1 troop transport, 1 resupply ship
Type 2: 3 destroyers, 2 cruisers, 2 capital ships, 1 carrier, 1 troop transport, 1 resupply ship
I believe area weapons will be equipped on my captial ships as suggested by the game. I haven't decided if remote shield chagers will be included on one of the assult ship types or one of the support ships to give them something to do in the middle of a fight. Gravity weapons seem to be the most destructive and I'm thinking about them on either destroyers or capital ships. I haven't played a game long enough to get to these higher tech levels to see how they play out yet though, for now this is all just idle planning