Hm...I´m not sure how much of this is actually leaked content and what was made up by the author.
While it sounds interesting at first to have a look at something that unfortunately never made it into an official game the level itself is really made poor. It looks and feels like in early alpha stage...there are a lot of rather empty or half-filled rooms, a bunch of guards and other enemies like priests and robots, and that´s it. The writings are ok(still, I´m not sure if they were from LGS or from the author), but can´t cover the overall lackluster feeling of the mission.
If you haven´t played it, you haven´t missed much. Wouldn´t recommend it.