WAY back in the earliest drafts of the Bible, the mission concept was for a 20-year mission in deep space w/o returning to a major planet or Starbase. That’s one of the reasons the ship was so big (to be self-supporting), as well as for the inclusion of families. One of the features the ship was supposed to have on-board was a mall-type area/Promenade where civilians had/could set up shops to trade with not only the crew, but any visiting crews from other ships encountered or newly met species.
Ultimately the idea got dropped but was resurrected in concept for DS9.
The deck by deck blueprints have the shape of the mall area available. Turbo lifts, and shape. Which BTW has a cave like rock design. So I don’t see why not. He’s proven that he can do a great job in filling in the gaps for what he can put into the rooms. A mall area wouldn’t be too hard to do. Just look at few bits of dialog and or novels for extra inspiration.