Aurora uses the generation ship model of transport, which . . does not go ideally. Many problems unforeseen for hundreds of years of travel in the utter empty (you hope desperately that it is empty). It's also a fast but not relativistic ship, .07C, at exorbitant energy costs. Hope you like the moon / mercury covered in purple lasers. Relativistic lower-mass vessels with the same technology, I guess, but the impact threat goes through the roof, and it's not a settlement ship. A better way to make the Aurora-style project is a small ship with frozen embryos that get birthed insitu by machines of loving grace. Then you can go faster, smaller.
But it's all talk talk. We're technically capable of doing these things, but I'm not sure we're socially capable of even lunar settlement at this stage of our history. Let alone Mars, the outer system. The Expanse was, in its own way, optimistic about our future. They just had to get medieval to get Earth's gas balance (and probably phosphorous! and who knows what else) back in the normal range.
Heh heh you know it's funny but if we took the solar system as it exists right now, a floating settlement higher up in the Venutian cloud layers would be closest[1] to fitting that bill, in terms of kgs of crap you need to carry around outside with you. Just, yknow, not anyone's typical idea of a "settlement".
[1] And yet so very damn far away.
