Saruzin was a large, heavily armored carrier used as a flagship by the Venomian Army during the Lylat Wars. It was primarily a long flight deck with two support wings to either side and command bridge towards the back. The Saruzin carried the Shogun warlord battlesuit and two Shogun Warrior battlesuits.
The Saruzin served as the flagship for the Venomian fleet during the Battle for Sector Y. In the final moments of the battle, when the carrier was threatened by the Star Fox Team, Saruzin launched both Shogun Warriors and Shogun itself as a last line of defense. However, all three robots were defeated and the carrier destroyed, ending the battle and scattering the defeated Venom fleet.
If one were to look at it solely from the front, one might notice that it resembles White Base(Or as called by the Principality of Zeon, The Trojan Horse), which housed not only the Gundam, but quite a few other Mecha made during the "V Project".
NINTENDO POWER Starfox 64: Official Nintendo Player's Guide. Redmond, WA, Nintendo of America. 1997.