The factory and powerplant surface layouts could be improved with invisible non-colidable lights. No need for them to be special in any other way (other than maybe a larger radius), they should draw power, and turn off in the daytime (which would save power for people who have theirs set to always day). If I understand correctly it wouldn't be too hard to do. Another option that occurs to me is that you could have a new version that includes the lights, and actually requires lights in the recipe, though that might mean adding a new tech so the recipe can depend on both the lights tech and Architecture.
This would be a Quality of Life / Verisimilitude idea mostly, but I know in my case it would really make me happy. I keep imagining getting my first power plant running and watching all the lights inside come on.
