I've built what's probably my biggest (mostly) vanilla base yet on Nauvis and I haven't even left yet. I want to have it situated before I leave. I think my Space Exploration base was larger, but I never finished it and it wasn't much larger if it was.

I'm really enjoying the fact that we can't destroy cliffs until later but they're also much better, combined with the new rail tools. My rail network is all currently really organic with two way rails and sidetracks. Previous versions I just built cliff explosives and plopped down two lane rail anywhere I went, which makes it brainless.