This is Figaro Castle from Final Fantasy 6. It is my third FF project in Minecraft, and my biggest so far. Shortly after starting Figaro, I realized it would be about 10 times harder than Baron from FF4. The inner/outer geometry correlation is extremely lopsided in Figaro. I had to take quite a few liberties.
I made the texture pack myself. I will post the texture pack and world file at a later date so everyone can explore Figaro on their own.