ringworlds - sphereworlds

[PvK]

Ya, I've actually considered changing one or these in Proportions mod to simply be a sun-destroyer-foiling device.

PvK

[Slick]

They take a huge amounts of resources and time. From an economic standpoint, the break-even point is normally well beyond the length of the game so, unless the game is incredibly long, it's not worth it economically. If you haven't made one before, it's kinda fun, though.