BTW concerning decks, that's an interesting question. I haven't seen any mention of how many habitable decks Galactica has. Battlestarwiki has this intriguing size compartison chart
...comparing to a Nimitz-class carrier.
According to the wiki, Galactica's dimensions are
Hull:
* Length: 4,640ft or 1.414 km
* Beam: 1,820ft or 555 m (flight pod to flight pod - extended)
* Draft: 580ft or 177 m (source: SciFi.com)
Flight Pods:
* Length (approx): 2,019ft or 615 m
* Beam (approx): 360ft or 110 m
* Draft (approx): 211ft or 64 m [2]
http://www.battlestarwiki.org/wiki/Galactica_type_battlestar
also, "Galactica's crew complement prior to her scheduled decommissioning was approximately 2,800"
Here is the description of Galactica's main sections
Main Hull
This comprises the bulk of a battlestar, and can, itself, be divided into three sections:
The "alligator head" contains the primary living space for the crew, recreational facilities, mess halls, shipboard operations centres (such as the CIC and Situation Room)[1]; water storage tanks (Water).
The midships area contains the pod retraction mechanisms, crossways linking the hanger pods for the transfer of equipment and personnel, as well as all the necessary hoists for such transfers (Mini-Series). Main munitions stores and distribution mechanisms to "local" munitions stores for main and secondary batteries; fabrication facilities; etc [1].
The stern section contains sublight engines, FTL drive coils, etc. Note that 4 of the sublight engines are mounted externally in engine pods, with 2 more mounted between the pods, in the stern of the battlestar's main hull.
BTW totally off topic, but some interesting research indicates that the TOS Galactica was 4,150 feet long (or about 500 feet shorter than Ron Moore's battlestar)
http://www.tecr.com/galactica/capships/battlestar.htm
And here's a sketchy cutaway of the TOS battlestar (non canon)
http://ravensbranch.allen.com/galacticasize.html