[DirectorTsaarx]

I actually built 3 ringworlds simultaneously once; in one of the trinary systems that appear in-game. That system also had a single huge asteroid field that I converted to a huge planet before I finished the ringworlds - that way I could stick all the system-affecting facilities somewhere besides a ringworld.

In a different game, I built a sphereworld, filled it with weapon platforms, converted some of the shipyard bases to fighter platforms, opened multiple warp points over the sphereworld, and then populated the colony with captured population from the Terrans. It was a pretty cool idea, I thought - use the sphereworld as a gigantic POW camp (I mean "relocation facility"), and make it a major defense installation at the same time. After all, there's no sense sacrificing my own people in a potentially huge battle with the enemy...