The idea of a Sci-fi save sounds great. I once tried to rebuild oasis springs in a sci-fi theme but never managed to get it finished. I might return to it some day.
By now we have so many worlds from so many packs, that rebuilding everything is very much work. I would begin by starting (or downloading) a completely empty blank save with no buildings and just focus on one world or a few neighbourhoods to rebuild and leave the rest blank. I would focus on those worlds or neighbourhoods with few decorations like oasis springs or the island in Windenburg (just this one neighbourhood without background buildings). Another route could be to go for really modern looking neighbourhoods like the uptown financial district in San mychuno or the foxbury campus in britechester. You can change the lot type of the dorms and use it as a penthouse lot, just like the ones from San mychuno.
For builds there are quite a few nice assets in get to work and strangerville. If you like a more dystopian grunge vibe also journey to batuu
For gameplay I find useful things in
get to work
- inventions in the science career
- aliens
get famous
- the sleeping pod. If only we had a matching toddler pod
discover university
- servos
- robotic arm and exo skeleton
- various household robots robots
eco lifestyle
- the fabricator as a way to create objects, if I am informed correctly it even allows to make one food recipe if you unlock it
- the tech looking planter