I Need to create a short cut for this statement, "Everything must tell a story". When I started on the Qeynos trade skill center I went straight to Disneyland and its themed areas for inspiration. Every section should tell a story on what is crafted in that area. Break down, tailor in center common area, spell craft in the posh library room. Potion area had a bit of an accident resulting with a hole in the ceiling and magically twisting the room, I personally blamed the gnomes. Armor crafting is found in the bedrock. I also make these distinctions to help with player navigation. At all times in these maze like buildings you should have a good idea of where you are. Nothing to me as a player is more frustrating then immediately getting lost in identical looking rooms.
When this area first went to QA I got one of my favorite bugs. Basically it was a detailed write up with pictures and diagrams, on how the potion crafting room was twisted. Not a bug, those pesky gnomes I tell you.
Responsible for, design/layout, geo construction/uv, some prop placement and lighting.