Yes, the place is quite huge especially since it is one zone - you can free fly between the Upper, Lower and Core (if it was open) parts if you have enough flight time/pots. Fortunately there is an "elevator" of sorts that flies you between Upper and Lower without using flight time as we wouldn't be able to make it at this point without it.
Still, you could possibly hide a force in the open space between the two layers for a short time at least or just use it as a less noticeable transport medium. It mostly depends on what kind of flight time people have at 50.
"Oh, hell no," Kylar said. "You cannot fly. Tell me you can't fly."