Re: ringworlds - sphereworlds
They are just a big world. After it is built, you must colonize it and develop it like a normal world. It can hold a LOT of stuff so the time scale of the game needs to be taken into account. If a world holds 100 facilties, then it takes at least 100 turns to fill it up. Same thing with a sherewhorld and AvStTech, 240 facilties, a long time to get totally producing. There is a lot of cargo space as well, and many shipyards in orbit to fill it with cargo if you want.
Another rarely mentioned advantage is that the sun changes to a planet. Therefore no stellar type manipulations will work on it. i.e. no stellar explosions, but planet destroying would work, but would just not kill everything in the system. Watch out for multiple suns though. You must do them all to have this protection.
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I thought of the sun as a big bright ball of something that produced an intense absence of darkness. Alan Dean Foster No More Crystal Tears
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