Oh, right. Good.Ratty, if you look at the player setup you will see Vault City listed as one of the civs.
By the way, what is this "Unity?" Some kind of a remnant of the mutant army?
As for other factions, I think there should be less unusual factions like Empire of Circuit and Children of Set, and more midsized communities (see the medieval Europe parallel above). For example - Vault City, Broken Hills, Modoc, Shi, New Reno, Redding, perhaps even Gecko. NCR could begin as the largest state with biggest population, but tormented by various problems, such as, for example, overstretched military, low technological level and abundant raider attacks. New Reno could be wealthy and fastest-growing, but extremely unstable. Redding could be extremely wealthy, but with virtually no military and thereby extremely tempting to its neighbours. Vault City could be blessed with highly sophisticated technology, strong government and stable economy, but with small population and very slow growth rate. Broken Hills should likely be similar to Redding, but with a stronger and more advanced military, and a more unstable government (due to friction between human, ghoul and mutant population). Modoc could be an agricultural paradise, with plenty of fertile and irrigated land, and relatively remote (and thus safe from various would-be conquerors). Shi could be a large, technologically advanced and fast growing nation, but weakened by internal conflict. You could even incorporate some sort of a schism that would occur under certain conditions (if that's even possible), where Dragon's faction would take San Fran and Lo Pan's faction would take... well, some other city.
During which time period does your mod take place? If it's prior to Fallout 2, I don't see why you need this Empire of Circuit thing when you have the Enclave, a faction technologically so superior to others than it's virtually invincible in earlier stages of the game. Their capital lies off the Pacific coast and is therefore unreachable for other factions, since none of them posses naval technology. Enclave, on the other hand, can go just about anywhere with its awesome vertibirds. There could even be different types of vertibirds - transportation type, for deploying soldiers on the continent, and settler type, for establishing new bases. Later, perhaps, Shi would have the opportunity to construct a tanker and attack the Enclave (it would be a wonder rather than a regular unit), and Enclave would be able to develop an FEV WMD to destroy all other civs and beat the game.
If, on the other hand, your mod takes place after the fall of the Enclave, then, ummm... why is Enclave one of the factions?
Those were some vague and general ideas I had. Maybe you can use some of them in Civ 3 Fallout mod 2.0.
