What the rest of the ship looks like because I have writer's block:
Entrance: Has an extending gangplank and platform to get in. The mast has Greek and Latin etchings carved into it, and the sails include the CHB flag, the SPQR logo, the hunter's sign, and a flag that represents the parents of the original 7. There's like this elevator/platform thing that goes up to the crows nest, where Leo installed high-range binoculars. There's also this giant crossbow thing right across from it, and there are ballistae and plates of celestial bronze along the sides. There isn't any Festus jr, but there is a giant cannon at the front.
Downstairs, 1st floor, starboard side: Mess hall, kitchen, and library. Has the virtual real-time screenings of the two camps, camp cutlery, and a direct way to the horse stables. There's also a door to the port side. The mess halls sacrificing flames are hidden in a flame-proof wall and can be opened by pressing a hidden button on the roof. Door on the far left corner leads to library, which can also be accessed from a secret door next to Percabeth's room.
Downstairs, 1st floor, port side: Engine Room, Med bay, swimming pool, bathrooms and living quarters. See last chapter for rooms. Engine room also takes up the next two floors, since there's no Festus to program and Buford wants more space.
2nd floor: Training room (Programmed to only open to a demigod's touch), Armory (locked, key is hidden in the engine room and only Annabeth and Leo knows where it is), stables (There's a glass door on the side that can open up if needed) and the second floor of the engine room. Weapons were either hand-forged or stolen from the Ares cabin (Stoll's). Training room takes up most of the space (Port side, plus some of the front of the starboard side)
3rd floor: Engine room, oars, and storage. Oars and engine room are close to each other since the controls are mostly there, with some on the 2nd floor. Storage containers extra supplies if repairs need to be done. Also has an emergency exit with a ladder and an extending stairwell.