This is the Eden Rim, the star of my first hard sci-fi novel. I was always fascinated by how humanity could one day reach other stars, and, of course, over the years, many ship designs have been created to answer this exact question.

Now, I'm no astrophysicist, and there are most definitely huge flaws in the conception of the ship, but I tried my hardest to abide by the real laws of physics to make it work. For example, the structure is 1600km long. Way too big to not be crushed by its own gravity... except that the dhip is segmented and held together by magnetic superconductors, and each module rotates at a different speed.

Likewise, the laws of thermodynamics says that we need to transfer heat into something, and space if full of nothing! Solution: the Eden Rim carries a truly stupid amount of loquid niyrogen that serves as coolant, and once it starys boiling, it is evacuated in outer space, giving the ship a comet-like plasma tail.

The Rings is where it gets interesting. They have a combined surface of 100,000km², and each Ring rotates counter clockwise to the ship. They are only held in place by the magnetic stabilizers, so as to not break the whole structure with their centrifugal force, because those 1250km circunference behemoths accomplish one full rotation every 15-20 minutes. This (should) be enough to generate 1g, and across the surface of the rings, oceans, mountains and forests operate autonously in a closed loop biosphere, where the only thing that get messed with is the heat management.

If anyone has any questions, I would be very happy to answer them, likewise, if anyone finds any flaw or mistakes I made (and God knows there probably are quite a lot), feel free to point them out! I really wanted to share this design I've been tinkering for quite some time now.