The Alice Knowles (take the link for an image) was a whale ship and can be used as a type for the Christopher Mitchell. She was 115 feet in length, 28 feet wide, and 16 feet deep.
In the side view, the following is visible. The Captain and the Officers bunked aft. The 15 or 16 common hands made the front half home. Just below deck, in the bow, was the forecastle containing the bunks. This is where common hands lived. A ladder is visible leading from the companionway (a box cover on the deck) down. The opening in the companionway was the only source of fresh air. In storms, even this opening was closed. The bowels of the ship were for storage, mostly oil. Just forward of the main (middle) mast is the blubber hold. Between that and the forecastle companionway, on deck, is the tryworks and carpenter’s bench.
In the top view, the whale boats are visible, three on the port side and one on the starboard. Two spares rest over the cookhouse. Notice how restricted the area was for 21 men (a normal full ship’s complement) to live and work for 3 years.