The thing about that space is that it has a staircase down to A-deck, meaning that those little nooks on A-deck below the 3rd funnel deckhouse will remain empty unless Jason models the staircases, which would then make it look odd unless the ceilings above them were rendered, too.
Also, the sooner the staircases gets rendered, the sooner we will stop getting this glitch that allows us to go inside the walls of the A-deck.
As a bit of an added bonus, it will also give us a shortcut from the aft of the boat deck to the aft of A deck, and vice versa