I'm currently working on a number of artificial space megastructures. Recently, I've been trying to work out a couple of things to do with alderson disks:
- What a person on the surface would see (ie, there would be no horizon, so what would they see?)
- How sunsets/sunrise would like if the star was made to bob up/down.
- How big the ring would need to be in order to support multiple extremes (like hot deserts closest to the star, and cold arctics on the outside)
In terms of technical issues, the civilization that has made it is practically a Type-3 (Kardashev), with access to some technologies that are beyond even their understanding.
As for technical specs, I haven't decided on how large the radius should be, but for thickness I think something like 500km seems doable (roughly 50km of surface material/earth, and 50km of various subterranean installations and maintenance stations, and the other 400km would mostly be structural. So far, I think I will make the disk only one-sided.
EDIT: Summary Question: What would the world look like from the point of someone on the disk; what would the horizon be like, and how they would experience sunset/sunrise?