[@ClocktowerEchos]
[quote=]
Might as well chuck my name in for interest. How many cultures/races should be in one faction?
[/quote]
As much as you like or can handle really.

[quote=]
Also just to clarify, this is like fantasy races put in a sci fi setting with other sci fi groups?
[/quote]
Pretty much. Although not 100% sci-fi, you can have sci-fi aliens or whatnot living the simple life in a fantasy-like village/town, etc.