I don't recall ever mentioning anything about too many people participating in invasions, though I would agree that sometimes it seems like we have a ridiculous amount of forces present for a minor battle. I'm actually most in agreement with [member="Cyrus Tregessar"]'s concept right now, because of this:
I must caution against complexity, and keep the focus on conduct that affects faction-to-faction relations (dominions, invasions, skirmishes) first and foremost.
I don't think that most faction members aren't going to be interested in number crunching , but I'd wager that they'd all want to know how it roughly works. If it's too complex, I doubt that it'll last for faction. And even then, I don't think this will work on a complete "Galaxy" or "board" level.
Not only because of the complexity involved with just running the basics, but also because of inter-faction issues.
For example, what would happen if the Republic opted to "buy" a bunch of ships from the Mandalorians. Would that come out of the Republic shipyards points or the Mandalorians? What about allied fleets and the like? What if a major corporation defects?
Movements of ships and large forces are also probably going to cause other problems, especially with meta-gaming. For example, what if the Mandalorians suddenly realize that the One Sith have left a huge gap in their defenses to go fight a major campaign with the Republic?
I bet that even if the mandalorians did a lot of RP work to show that they were reconing the area (and didn't even know at first by meta means), that there would be hard feelings on the One Sith side when suddenly a strong force of Mandalorians swept over these areas with little to no resistance from One Sith forces.
Where I can see this system like this being used is in mini-campaigns between two factions.
For example, a couple related dominions, invasions, or skirmishes. Probably no more than four to five events, and not encompassing any other worlds except those around it (such as a local sector). These "events" could then than act as a single turn for production purposes. We could even spin it as "marshalling" reinforcements from other areas of a faction (new ships from Rendili have now arrived, or the latest batch of infantry from the Carida Academy, etc).
[member="Ali Hadrix"] | [member="Camellia Swift"]