The pictured colony is certainly a big one. Kalpana One is currently my favorite space colony design, in terms of relative feasibility and usefulness. One might ask, “what’s the point of spending tons of money on building a space colony when Friendly AI could build us one for free, and when unFriendly AI could easily take down such a colony?” The reasons are, 1) governments will spend money on space colonization whether we want them to or not, so we might as well keep an eye on the field, 2) space colonies are an insurance policy against pre-AI disasters, 3) the prospect is inspiring in general, and even if such colonies are never produced en masse in the real world, they’ll still be featured in the fictional worlds we choose to inhabit.
The pictured colony looks really, really huge. Probably would weigh trillions of tons. Seems to be about 50km across at the torus, maybe 1000km across total.