In most cases, The Hold.
orlop
you call it the bottom deck
The open deck of a ship is called the weather deck.
A raised deck at the back of the ship. Is a poop deck
The "poop" deck on a ship is an elevated deck above the poop cabin, at the rear of a ship.
The very bottom of a ship is where you find the keel. The keel runs the full length of the ship along its centerline and is the backbone of the hull. From the keel all the frames run out and up. the hull is attached to the frames. Picture the keel as the backbone and the frames as the ribs. The hull is the watertight skin that allows the ship to float. Within the hull are compartments (rooms) and at the top of the hull is the main deck. The superstructure is built upon the main deck.
Usually referring to as the "Poop Deck",it is the main deck on a ship.
* Orlop deck: The deck or part of a deck where the cables are stowed, usually below the water line. It is the lowest deck in a ship.
The top deck name is contingent on the type of ship or vessel. The top deck on a cruise ship is usually called the Lido deck. The top deck on a battle ship is sometimes referred to as topside or poop deck. The poop deck got its name from the amount of birds flying overhead.
No, but the orlop deck is the lowest deck of a wooden sailing ship with three or more decks.
Sailors must still swab the ship deck, which means they mop it.
I am not sure if you are looking for cruise ship deck layouts, or the plans for a deck inspired by the cruise ship deck layout. Either way, I would go to the cruise ship website for the deck layout (things to do), and do a general search for a deck you wish to build.