Yep. Asteroid belt. We've assumed a "parking orbit" with our Thrust Ring surrounding an appropriately sized asteroid. We brought the cylindrical elevator tubes to its North and South poles so that we could start digging.
Basically, it looks like we put an ankle bracelet on a rock.
Of course, the ankle bracelet has two habitats at a hundred and twenty degrees from each other that look like glass-enclosed cruise ships hanging from an Easter Basket handle, and a double handful of a two-mile wide casserole dish, with the Flying Castle in the middle of it.
Then the solar mirror, huge because of our orbit, reflects sunlight down to a second mirror, which slowly rotates to give each of our three habitats its own version of a twenty-four hour day.
Being offset like that, each Habitat starts its day eight hours before or after its neighbor. So if you're a late riser, you can still catch breakfast at the next Habitat over, by riding the spherical elevator cars through the cylindrical elevator tubes.
Oh, yeah. It's all rotating slowly, to give us artificial gravity at a Mars equivalent setting. Multiply your "weight" by point three four.
We grow our own food and oxygen, and make our own stuff and entertainment.
And the entertainment is particularly original. Good morning! The dragons are off to the herpet-vet. The rest of us are hanging loose. I picked my second Japanese eggplant, and I’ve finally got a regular eggplant growing.
Thanks, Bob! I couldn’t have said it better!