Recreating the Sims 4 Worlds

I'm tweaking each world as I move through my Local Color challenge. Some builds I'm leaving as is, some I'm downloading from gallery, some I'm building. I'm working on one world per generation, plus the "adjacent" worlds that they can travel to, one of which is always a world they lived in already. Since it's limited like this, it never feels like a lot of work, but it will take a long time for me to finish the challenge. During much of they year I have only short periods of gaming time available, and I also like to play scenarios and stuff.
So far I've rebuilt/tweaked to my liking: Brindleton Bay, Mt. Komorebi, Willow Creek, and maybe 2/3 of Newcrest.
I don't know if I'd want to keep these versions of the worlds in every save I play though. I feel like customizing worlds is part of what makes each save/story feel unique to me.