I've been working on this project for a while now. I'm trying to build the Jedi Temple on Coruscant from Star Wars. Unfortunately it won't be built to scale, as the temple is way too big for this game's limit. I could have hollowed out the ground and built it from bedrock, but I wanted it to stand on water level - and hopefully feature underground floors and chambers etc.
There is actually a huge network of dungeons and tunnels below the temple, with several openings in the temple floor leading down to them. I discovered them by accident while improving the floor.
I have already explored them extensively, but every tunnel just leads to another huge room connecting even more tunnels. I wonder if this is the mother vein of tunnels, never ending - streatching far out into the world around.
As the temple won't be to scale, it also won't feature all the rooms etc on the inside. I'm making my own layout of the different levels and how to arrange stairs, bridges etc.
I am building this in Single Player with the Difficulty set to Peaceful. I always change the Difficulty back to Normal when exploring caves tho - just for the added excitement. I still have a stack of 64 diamond swords and full diamond armor most of the time. I use INVedit for that and any other thing I need.
Will update this post with more information later.
Outer body frame complete
Ground floor complete
Inner body frame complete
Main entrance & The Processional Way (in progress)
Inner body interior (in progress)