By any chance does the EP setting have any of the proposed Mars (or other destination) Cycler spacecraft? Those proposed large vessels in permanent orbits between Earth/Mars to serve as a sort of moving way-station for large scale exploration and terraforming efforts? Or did such things exist and were easy targets during the fight with the TITANS? If not it strikes me that they could serve as interesting areas for adventuring in... sort of all the hallmarks of a habitat combined with the element of moving somewhere...