LOL @ trying to explain design in Star Wars OT with supposed “engineering knowledge”.
Cloud city looked the way it looked for aesthetic and storytelling purposes. Not because of physics. This is Star Wars, ffs. Ships go ka-boom in space in these movies!
My point exactly, Cloud City is a “magical” safe-haven floating in the sky to welcome the Falcon (heck the previously bright clouds even turn dark once it’s been revealed that the Empire set up a trap). That’s it. It has plot value, symbolic value and looks awesome. It doesn’t have to make sense logically.