I was wondering if anyone had this thought as I do. The Galactica looks like it is "ribbed", it also looks like the reason for the ribs is to hold armor plate. If you look closely you can see armor plate in certain areas, and ribs in others, like the armor has been removed.
It is possible that since the Galactica was having its de-comissioning ceremony during the Cylon attack, it is possible that they had removed the bulk of the armor getting ready for museam duty.
MarkyD or anyone else who wants to tackle it, could you re-texture this model so that it is fully armored like the Pegasus ?
Link to New BSG 75 Model:
http://www.battleclinic.com/docks/files/dist/index.php/file,baf01f54c4322bf73d9907d1541bc8b9.zip