I'm currently working on the Great Southern Abyss of the Durin's Builders Moria build. Our terrain in this whole build is completely handbuilt; we use no plugins except to do very minor things, such as changing bedrock to black wool.

The Great Southern Abyss of Moria was a massive rift in the southern portion of Moria, and was home to the city's waterworks. The cavern was spanned by many bridges and highways, and was a major part of life in southern Moria.

Other members of our build team and more information about the project as a whole can be found on the main page for the project, found here:
https://www.planetminecraft.com/project/khazad-dm-great-realm-of-longbeards-clan-on-the-misty-mountains-moria/