I really have no idea how to do it properly. I was thinking a wedge shape 2000 m long with 2 m height difference would be 1 m thick on average. Then one can bui

I really have no idea how to do it properly. I was thinking a wedge shape 2000 m long with 2 m height difference would be 1 m thick on average. Then one can build a circle out of those. With a pyramid you could build a sphere (kind of). It was originally a napkin calculation from someone who did. The pun [if you like] is that a flying city is doable but one has to think much much bigger.