The largest of the Ceres class cruisers, the Cataphract. I'll try to get a screenshot of Eeloo 1, Kshatriya, Archimedes, and Cataphract together, provided that the game doesn't crash.
Specs without lifting stages.
Wet weight: 531 tons
height: 19.9m
length: 45.4m
width: 35.8m
Fuel Load: 60324 units of Liquid Fuel
Engines: 26× LV-N Nerv
Maximum Thrust: 1560kN