Hi all,
I'm doing my thing as Director of Hospitality for Galactic Conquest. I never thought you would post here--I am sorry I didn't check on the Forum sooner.
Galactic Conquest really is designed to work with SFB. If you want to play with an established group, you can probably make do with G3, the SFB Master Rulebook, and (of course) the GC Rulebook. You'll want to add modules that have ships for your empire. For years I played the Frax with C4, G2, and the Master Rulebook. As I branched out, I added the necessary R modules.
Now, if you are planning on GMing a GC campaign, you would need practically everything that ADB has put out, omitting only those books that contained empires you didn't plan on using.
Our maps (and the program to open them) are found on the Legacy BBS. It is convenient for us as electronic maps do not get disturbed by Space Cats.

We don't use counters, just electronic paper. (This campaign system goes back to the days when people typed on a real typewriter and sent in their orders in overstuffed envelopes!)
Not all games are blind. Universe 5 is an open map--we all know where everyone is. Universe 3 is sort of open. The Galactic Powers do not know where Andro bases are located or the RTN is.
The campaign system really is designed for LOTS of players and it does require a GM. Unlike F&E, you don't get to watch the fleets gathering up to attack you--you may only get warning when enemy ships appear on your sensors, blockade your worlds, blow up your ships, and raid your Merchant Marine! (The reverse is also true--the enemy may not see you coming until you snatch a world right out from under his nose.)
Like ScoutDad, I'm playing in U4 and we just got back the results from our first turn's orders. Unexplored space is full of Danger. I have a potentially hostile something headed straight at the United Federation of Planets.
All the currently running campaigns have openings for admirals, brave and true, who will lead their empire to glory. The GMs will help newcomers as will the members of the Rules Committee (Howard Bampton and I have promised not to let prior knowledge influence our decisions and what you tell us, stays with us. The GMs are completely trustworthy.) If you are just starting, I think U4 will be your cup of tea--there empires are small, the fleets are small, the "known world" is small (for each empire, that is), and your budget is tiny (in the hundreds of EPs as opposed to the 10,000+ I was managing in the earlier campaign).
If I can play Galactic Conquest, I promise you that any one of you can. If you have questions, feel free to email me and ask!
Jean
ISC Queen (U3)
Federation Admiral (U4)
Gorn Admiral and Protector of Furry Bunnies (U5)