I am going to have my party travelling to different planes in search of a lost city.  The lost city is a floating city from an ancient magitech empire that disappeared. It's sister city floats in the Fey Realm.  The party will have to travel to the fey realm city, research and investigate the location of the other city's original ascension.  When they get to the original launch point, they can use a magic item I gave them to plane shift into the lost city - which is in Limbo

So, I need a city map for a floating city in the Fey Realm and one in Limbo. The one in Limbo is crumbling at the edges as Chaos eats away at it.  I am going to have a monastery of Githzerai within the city.  Just need some artwork help.  

Any links or submissions would be awesome.  Thanks

My immediate thought would be to look at the radiant city module as the concept is not dissimilar. 

Look up Czepeku maps: https://www.czepeku.com/

They have made lovely maps and I know there are a few floating cities in their collections as I have used them in my games recently.