I would love to do that too. The problem is that you have to comply with the laws of whatever state/province/country on whose land you build the city, so you ar

I would love to do that too. The problem is that you have to comply with the laws of whatever state/province/country on whose land you build the city, so you are often restricted in many ways - not least in understanding the regulations and working with the government to demonstrate compliance. These guys https://www.seasteading.org/ https://www.seasteading.org/ are working towards building floating cities. In the short term, they want to figure out the technology part of it, but in the long term, they want to build cities in international waters and declare independence. Then you can do whatever you wanted to.