Just an area where you may do some research. Paizo did put out an interactive scenario (6-00 Legacy of the Stonelords) where
There are also three other scenarios that involve investigating other Sky Citadels that you could use to to see how they are linked and the kind of things that are in them. All three Glories of the past parts 1-3.
4-22 Halls of Dwarven Lore Glories of the Past part 1 has
4-24 The Price of Friendship Glories of the Past part 2 has
4-25 The Secrets Stones Keep Glories of the Past part 3 has
All of those scenarios could help you get ideas about what a sky citadel might be like but you don't have to use any of them.
A lot of season 5 pathfinder scenarios involve investigating the Worldwound to find out where Jormurdun is.