[Fnord-Fnairlane]

The "non rotating mag-lev ring" idea does not work, there are several problems with it. You cannot build a ring-world out of normal materials, they do not have the required strength.

An example: no matter how much Jello (TM) you use, or how thick you make it, you can't build a scyscraper out of it, it isn't strong enough.

Your proposed mag-lev track will gravitationally collapse under it's own mass into a series of planet-like objects, almost certainly in unstable orbits. Magnets don't help.

The second problem is that there is nowhere NEAR enough matter in the solar system to build it unless you're mining the Sun for matter, which is a difficult engineering problem.