“living” space stations

tentative - portals: favored spots by certain beings, noticed by humans/turn into cryptids

giant stations, so big you can go for a long time without seeing a window to the outside, kowloon walled city

artificial habitats inside

various actual land sites, portals

everything shitty

What i have so far is all most of my main characters thus far are artificially created, so they're all unique. I plan to make actual Species at some point, and i might make some of my existing characters part of a species but i havent gotten there yet.
I have no set reason for their creation at this point, but i like the idea that a "person" with a lot of societal power just likes doing it for "fun", or that they're trying to create obedient beings to give them more power/ secure their power, ex. creatures solely for fighting.

There's a large population (unique beings or populations of actual species i havent decided on) on a meandering station. It cannot land anywhere, but it has the ability to set up portals to nearby planets, and only nearby planets. If it gets too far away the portal will no longer work. If enough of the populace finds a certain planet interesting enough, it can secure a temporary orbit. They have no plans to live on an actual planet, their station is their home.
They constantly expand their station, and work with artificially created organic materials, so their station also "grows" on it's own. They also use whatever space junk they find to build up the station.
I want the look of the inside to be heavily based on the Kowloon Walled City.
They have various artificial terrestrial habitats within the station, based on previous planets' environments they've visited.

My main so far are lost on a planet. I can't decide if i want them to not recall how they got there or not. They remember their lives on the station and want to go back, but they can't locate the portal. They have time to find the portal.