Creating a Sci-fi save

That's a really cool way to set up a save! I'm wanting to do something similar. I've worked on it some a few weeks ago, just sort of planning out the general ideas of a few worlds. One of the ideas I had was to make some cyberpunk type abandoned factory areas areas in both evergreen harbour (the area near the docks) and the upper-left neighborhood in Del Sol Valley (where Vanessa Jeong lives). I'm picturing the big, futuristic mansions in the upper right neighborhood are home to the rich sims who don't even really know that the cyberpunk area is there. I'll probably use an eco lifestyle mod I found to make the air dirty in the abandoned areas.

I'm planning to, if possible, have my aliens not wear their disguises most of the time, since in this future world I'm planning to have different "planets" (worlds or combinations of worlds) Maybe I could have some areas where the aliens prefer to, or are encouraged to wear their disguises because the people in those areas are still getting used to seeing aliens everywhere.

Also I looked and there does seem to be a good variety of steam punk stuff. Thanks!

That's a great idea to mix and match historical and futuristic! Henford on Bagley would work especially well with this idea. Perhaps it could be a town/planet that still tries to stay traditional, but they are having to adapt to modern times. I like the idea of a castle, maybe the world could still be ruled by a monarchy. Maybe their technology could be less advanced than other places, and perhaps their focus could be on farming (I believe there are some alien plants that sims can grow)

That sounds like a good way to approach it. I tend to get easily distracted and jump from one thing to another often. I agree that it would be best to go world by world and to only use a few worlds, ant least to begin with. Some places, I'll likely just download some futuristic lots from the gallery, but if I want a particular theme for a world, then I'll likely build it myself. I'm not much of a builder, mostly I renovate what I find on the gallery. For this save, I'm going to give it a try, especially since if I make a mistake or something turns out kind of quirky, I can just say "But it's a sci-fi world! It's supposed to look like that" lol. I never thought of sims living at the university dorm lots, but that would add another city-like area (the game is quite lacking in modern city areas, in my opinion)

Also, thanks for the list of objects. I'll probably use most of them for my save. Unfortunately, I don't have strangerville or Batuu (the two best packs for sci-fi) but I'll look for some similar cc.

I haven't seen that episode (I've mostly only seen the original Star Trek series), but that's a great idea! As I mentioned to Simmingal, I'm thinking of doing this with Henford On Bagley. As far as Copperdale, I would have never thought of using it as a theme park, but I can see that working out really well! I'll probably add some rental houses for sims to stay in, and some themed lots for sims to visit.

That's interesting about Las Vegas. That gave me the idea to do something like that with Willow Creek. It could be a very exclusive area that has been designed after historical towns on earth, and is known for being a sort of traditional town with lots of gardens and parks where, as you mentioned, the sims who are more traditional and don't like the modern places live. Maybe there are strict guidelines in place where everyone has to be very environmentally friendly and keep up the neighborhood and such. I'm already looking forward to designing it!

I do plan to have lots of robots and servos in my worlds. I think that most people would have at least one robot in the future. (if real technology continues to advance, it may not be that long until we actually have robots in our homes.) I wouldn't have thought about putting landing pads on the roofs, but I'll likely do that (or put them in place of the garage for smaller houses. The save will probably be set close enough to the present day where the furniture and such look the same as it does today, since it would be hard to find futuristic furniture cc for everything.