I'm currently trying to put together a generations style Rimworld modpack akin to Mr. Samuel Streamer's Generations 2 modpack, but with an emphasis on the Empire Refactored mod and collection of submods and various world expansion mods that allow the other factions to grow, develop and war with each other over time.
So far I've got the base of it down; the ER and world/faction expansion stuff and performance mods, now I'm working on the actual meat of the content; new mechanics, items, questlines and features. The goal with these, if/once I work out how to put in the era progression systems, is to lock item access behind each era, as well as some world features/progression (explained as the various civilians expanding and forcing entities out of their natural habitat/going extinct, and new technologies unlocking), with some stuff growing obsolete or being removed from the crafting menus entirely.
I'm not sure if I'll be able to put this off as I have no experience with this kind of thing, but at the very least, even if I don't manage to implement the progression side of it, it'll be a nice little world domination themed kitchen sink pack.