Christine "TrandoshYar" Chugon is working as an artist at SOE for Star Wars Galaxies. She's responsible for creating The Tomb of Exar Kun -- an heroic encounter dungeon. You can read how the dungeon was made and what had to be done to make it reality.
This particular dungeon started out as a pencil sketch given to me by Travis "Shadowbrak" Hicks, designer for the Exar Kun encounter. He gave me a layout of room sizes and what the overall theme of each room would be.
Here on Galaxies we use the 3D program Maya. In Maya, I blocked out each room, and using a default human mesh I guessed how big each room would be.
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