Status: not posted to halfbakery yet.
Instead of a space station city:
City built of [link]Sub Marine Buildings or [link]Submerged Buildings.
run by thermal, wave, sea current and wind power stations.
Transportation with [link]Sea PRT. Oxygen and wood provided by [link]Sub Marine Garden.
Beach saltwater pool.
Building submerged in water 15 stories down.
Building underwater. Light pipes and snorkel. Organic sewage and treatment station. Window to sm garden. Seawater powering most systems using hydraulics since water abundant.