[Spyder]

Hmmm....you need 2,619,999 research points (minimum) to attain the ability to make RingWorlds (500,000 for Starbase, 103,333 for Ship Construction, 2,016,666 for RingWorld Generator).

4,966,666 more to make SphereWorlds.

You start the game with 25,000 free points, one planet with a dozen or so Research I buildings.

It seems to me that there would be much more important areas of research early in the game. Things like improved mineral production, improved research, weapons research & Intelligence after meeting your first enemy....I don't see (and maybe I need to play more) how you can get here and still have a need for an artificial planet. If you DID rush here and still had a viable empire, it seems to me that you'd have PLENTY of regular planets to develop without having a need for an artificial one.