Looks pretty cool. About the only way I can think of to make this useful in-game is to texture it and bring it into a 3D viewer of some sort - a game engine editor would be cool - and show the players scenes from first-person perspective as they explore. That would actually be very cool...though I expect it's a lot of work.

Is this from Paizo's Council of Thieves adventure path? The name rings a bell and the overall layout reminds me of the map there...but I've been focusing on running Rise of the Runelords so I've just been putting flipping through the new issues when they arrive and putting them on the shelf.
M