Yanro-ci-Demann

Yanro-ci-Demann, or "Living space for all" is a megastructure halfway through completion located in deep space, near the world of Dedre. It acts as the effective capital of the Yanro-ci-Estathul, and in itself houses a majority of the T-rak species.
== Structure ==
=== Current ===
Currently, Yanro-ci-Demann has its outer shell complete, but the insides and the orbital infrastructure have yet to be constructed. Physically, it is a shell of metallic pseudomatter 3.9 AU across, supporting (so far) twelve consecutive levels. Each level is a thousand kilometers thick, made again of pseudomatter, and seperated by a million kilometers of void. The unique nature of the T-rak species makes it so that the environmental controls are redundant, and are only used when supporting non-T-rak persons living on the surface. 
The surface of the sphere is covered in urban environments, used to support the other four species of the Confederacy. While they remain a vast minority of the population of the structure, they are present on the surface nonetheless. 
At the center of the structure is a artificial black hole, with the mass of 3.955 × 10^34 kg, or around 10 000 average G-class stars. This gives the sphere a surface gravity of approximately 0.79 G, making it comfortable for every species that lives on or within it. 
=== Planned ===
When the structure is finished, which predictions say will take over a hundred thousand years if progress keeps slowing down as demand decreases, the whole structure, not including the black hole at the center, will have a mass of over 10 suns (or 3.3 million Earth masses). This mass is so obscenely large and the engineering required to pull this off is so magnificently complex that there are increasing calls for Yanro-ci-Demann to be opened up for every species, not primarily T-rak. 
Upon completion, or possibly some time beforehand, numerous G-class stars will be maneuvered into position orbiting the structure. One will act as a primary lightsoure for the surface, Will some others will be placed orbiting at the far edges of the system, each supporting an engineered solar system in which every planet is terraformed and supports life and industry. Drifting in the void between the Far Stars and the structure itself will be uncountable megastructures, to be built years after the full habitation of the structure.
Millions of years down the track, the Confederacy has plans to go full isolationist, moving every species home system to orbit Yanro-ci-Demann, as well as the engineered systems, and then semi-cutting a spherical region of space, about five light years wide, out of reality. This region will act as the bulwark against the rest of the universe, the ultimate bastion. Matter will continue to be drawn in, and put in orbit around the structure, while waste will be thrown out.
This is the final fate of Yanro-ci-Demann and the Confederacy as a whole, the ultimate dream of isolationism and defensive strategy.
Theoretically, the structure has the capacity to support practically uncountable amounts of people. But, with time and a few smart edicts, the entire structure can and will be filled. The structure has a surface area of 359,982,535,800,000 square kilometeres, so therefore the theoretical upper-limit to the structure, assuming the max limit to living comfortably is 2000 people per square kilometer, is 719,965,000,000,000 people. This is 719 trillion people. Something must be wrong with my calculations, because that is ridiculously small compared to the surface area. Hell, there are planets with more people than that. Lets assume a more far-fetched maximum population density - 20000 people per square kilometer (this is more overpopulated than the most overpopulated place on earth by a factor of 10). Still, that only gives us 7.19 quadrillion. The structure should be able to support quintillions easily. Hmmm.