3 links have been added on this idea.
  1. Check this out! Saudi Arabia has plans for a 100-mile mega skyscraper that could house 9 million people.
    https://www.theguardian.com/world/2022/jul/27/saudis-unveil-eye-popping-plan-for-mirrored-skyscraper-eco-city

  2. Already done! China has a self-sufficient mega residential complex that houses 20,000 people.