Yes, I'm worldbuilding. Again.
Its one of the unique features of being a writer of speculative fiction. At the very least we usually need to bend what relevent reality exists. Usually we end up starting from scratch. Right now, I'm creating a factory that is ring-mining a gas giant and the culture that would go with it. Hell of a lot of work to add to the process or storytelling, but its part of the fun, part of the act of creation.
Still, I can see why so many of my peers tend to prefer trilogies, or same-world series :)
Looks like this one is going to be a bit of departure from my last four novels; for grown ups, rather than YA, and 'dark SF' (if there is such a genre - if not, I guess I just invented it). Still in planning, though, and a long way to go. Still, it takes my mind off wondering how the two I have out on submission are doing.
The fun just never ends :)