There is also CMO26 (Gulf Breeze) a giant Oneil Cyclinder, There was also another Oneil Cylinder destroyed during the Amaris Coup, too much trouble to take, so they just nuked it, the Mirrors for Venus used as death rays by Amaris, Galax Shipyards. Your description of Camalot command seems exactly correct, they hollowed out an asteroid, similar to the Ruins of Gabriel. A large number of the mega Engineering Projects was terraforming, Mars and Venus being the prime examples. You can also look at the diffeence between the 1st and 2nd SW maps to see several others, that collapsed due to lack of trade, technology, or the environments were too damaged for technology to salvage.