Niven Rings are more on the scale of a Dyson Sphere, and vastly larger than Corazonia was shown to be. This was closer to a
Bishop Ring; judging from the shot we see of buildings and landscape on the ring's inner surface it's way smaller than even the tiniest
Banks Orbital.
EDIT: I did a back-of-an-envelope calculation – based on its rotation speed and apparently Earth-like gravity, and the height of buildings visible from space vs on the surface, the diameter of the ring works out to about 200km. This would make the surface area about 3000km². It's more of a large city-state or colony than an artificial world.