Made a model edit which takes you to the outside of BWL so you don't need to clear the instance if you want. If you don't trust me, don't download it. Just making it easier for those who do.
For the first model edit, go to the first gate in the first room to the 2nd room. Put the MPQ in the folder, then follow the altars to outside of the mountain then slowfall down the ground and get to the building.
http://www.megaupload.com/?d=GCW1D2NP