Cant help it still need to get my head around the Spires.
on re reading re assessed Habble Landing thought it was ground/surface but no they carved a hole for themselves in the spirestone and built the landing platform. Was no "original" entry point to surface but there must be one as people and goods do get in and out to the surface [Capt Pine and crew]. When the Landing is destroyed ships and people fall to the surface which isnt visible so must be a considerable fall. So question is are there Habbles below Habble Landing. If Habble landing is "floor 1" and there is say for arguments sake a 200 foot drop to the surface that once again squashes the available room for 250 Habbles in the overall structure.
Must in fact be uninhabited habbles near to or on the surface. Need to supply water. There are cisterns in each habble but have to get water from surface so pumps and presume a central reservoir 2 miles by 2 miles by 50 feet would give a good volume of water if flooded... Habble lake.... room for aquaculture vats maybe shell fish filtering the water and providing food.
I also keep thinking why no internal lifts [steam powered or lift crystals] particularly as only 3 external doors. Commerce/trade would demand some efficient internal transportation system between habbles unless they are largely self sufficient and economically independent which doesn't sound realistic.
And .... so sorry but my mind got on to lighting. Habbles have translucent spirestone which is fine but how they are distributed would matter. if i was designing i'd have a circle of them high up so light is directed down on to the floor of each habble. Likely each habble would be designed same.
But if Habble Landing built its mezzanine floor over the same area minus the Monastery then that creates issues for where the translucent spirestones are placed on the outside walls and has to create areas or area as dark as ventilation tunnels either on one floor or the other.
Then theres population food production and distribution, management of waste [human and material] course none of which is necessarily needed for the story but helps if the world being created is believable fine point of course is where one draws the line and thats up to the author. We fans of course can let our minds roam as we will [and we will], to our hearts content. All that is thanks to the author.