I still say it should just be freaking built on land.
Also, the floating city of Columbia could have been built on a mountain instead of actually flying (which I am pretty sure is basically impossible). It reminds me of the proposed America Summer Palace for the president that was rejected by Woodrow Wilson for being too over the top balls-crazy.
There are many things money can buy. But one thing money can't buy is your momma, she's for free and everyone knows it.