This thread peaked my curiosity about how bid the Galactica is.
During my research, I found this article (I am not certain how accurate it is, though):
http://www.tecr.com/galactica/capships/battlestar.htm
Here are the specs (for this class of ship) that the author as stated:
SCALE: Capital
LENGTH: 1,265 meters
TONNAGE: 20,000,000 metric tons
SPEED: 0.2C sub-light
POWER: 1 Tylium energizer [7,360 Terawatts]
2 fusion reactors [43.8 Terawatts]
STANDARD CREW: 496 [1,012]
24 officers [32]
200 warriors - 90 are fighter pilots [240 - 180 are fighter pilots]
272 crew [496 crew - 134 civilian]
PASSENGERS: 510 troops [110]
CARGO CAPACITY: 600,000 metric tons
CONSUMABLE: 18 months [9 months]
MANEUVERABILITY: class C
HULL/ARMOR: 2.8 to 4 meters
EM-SHIELDS: 20% - 40%
SENSORS: Short/Medium range, sub-light, 200,000 m^3/s
SCANNERS: C at 300,000 kilometers
WEAPONS:
32 Blaster batteries
2 Turbo-Laser cannons
12 20 megaton Solonite missiles (anti-capital ship)
2 400 megaton solonite bombs (planetary bombardment)
FIGHTERS: 75 Starhound class Vipers [150]
12 Landram surface transports
12 Mk. VI space shuttles
Here is the link to the home page of this site:
http://www.tecr.com/galactica/index.html