|Transport and Living Quarters
Controlled centrifugally integrated modular habitats will accommodate all variations of space vehicles and planetary installations.
1): Ring living environments are modular and can be any size, although humans will be comfortable in larger rotating stations.
These can be permanent, fully integrated space craft that land and remain as planetary housing. Modular, they can always be removed and returned to service.
There are hexagonal cell designs, and other geometries for modular units that can be disengaged and transported to the surface. Gondolas transport to and from living quarters to the center hub where people descend or ascend from tram tunnels under ground.
Multiple and heavy-use, gravity units are, of course, separate from normal living quarters and must be so designed. There are long draw distillation columns and long drop fiber production in the elevator shafts.
There will be trams that connect life-rings. These corridors will be modular and will also provide gardens and utilities runs for the modular and expandable re-circulation life support system.
Longer term: Examine the potential of Martian concrete with cure methodologies. Concrete and fiber matrix composites.