The Battlestar Columbia was briefly seen in "Razor" in 2 separate scenes. The first was at Picon's Scorpion Spaceyard when the Cylons attacked. The second was durng a flashback when Adama explained that he had seen the different cylon variant (closer to the classic series) during his younger days after ejecting form his damaged Viper, and coming across a Cylon experiment using human tissues.
Scorpion Shipyard before and after the Cylon Attack
During the First Cylon War 41 years ago
There's no clear representation of how the Battlestar Columbia really looked like but we do have some fan based creation of her design with full armour. Just how accurate or canon these are are debatable but they do serve as very good reference materails for those who wish to build their Moebius Galactica into the Columbia.
Compared against the Galactica
Good luck to those who wish to build this variant. I may give her a shot but that is only if I can figure out a way to re-creater those extra armour platings. Someone out there may surprise us all out there yet.