There are a lot of interesting small space startups that are popping up right now concentrating on the idea of inspace assembly. For example, NovaWurks (watch their video, it’s pretty cool) is planning to launch multiple standard/rearrangable satellite buses and have them assemble into your desired spacecraft after the fact. Maybe that’s the best way maybe it’s something else, but it’s certainly tech that needs to be tried out to see what works and what doesn’t before we get to something so grand as orbital construction on a larger scale.
There’s a lot of cool stuff happening right now that isn’t exactly reported on in the spacenews media just because they’re small and pretty niche.
Another example is Caltech doing research on using hundreds of small nanosats to “assemble” a larger mirror to become a very large space telescope that couldn’t otherwise be launched.