There were chickens coops on board, but no live hens on board these days! The ship would have sufficient provisions to stay out for 6 months. These barrels were used for soaking salt out of the salt meat and vegetables before cooking.
If you were Nelson or a senior officer, you would have eaten in luxurious surroundings. The floor here is painted sail cloth.
For the rest of the crew and there were normally a total of 850 men, the tables, which were then taken down to hang the hammocks, were perched amongst the cannons. Everything including all the furniture would be stowed away, and all the lovely wooden partitions and panelling in Nelson's quarters would be folded up against the ceiling during battle to allow a full view and ease of passage along the whole length of the ship.
I feel that this would probably be a good way of using small modern houses too, but then it would not be beautiful wooden panels but some lighter synthetic material that is hinged back against the ceiling. I remember that during one of our visits to London from Mauritius, when I was a child, we lived in a lovely old flat near Kensington which had very large wooden partitions to dinning room etc which could be moved back to make a very large reception room probably as large as the whole ground floor of this house, if not larger!
If you were an officer, your lady would probably have embroidered you lovely hangings too! I never imaged a hammock to be rectangular shaped, and flat. I would like to lie down in one of these, and see whether they are comfortable or not. I would love to have a try! But I didn't think of asking!