I have no idea where all the ladders and hatches go. (I think there are from three to five ladderways shown on the plan, so that's a beginning at least). Same with the ventilators, nowhere on the plan, and photos differ depending on when the photo was taken (why? seems odd). I am looking at other models and plans to get an inkling of maybe some general placement rules, but each ship is so varied with gun and superstructure placement and details that I am inclined to think the captain ordered them up (!) I am sure that is not the case, but as "captain" of this model, I may make some executive decisions about these things soon.
Annoyingly, historic photos rarely show stern views, and of course with no drones or planes at the time there are no aerial views looking down on the deck layout. I need a time machine to go back to 1895 and take a tour to scout it out. I could say to the crew, Hey I can give your captain a model for his ward room. Just let me roam the decks for an hour and she's yours!