Pros:

-Excellent idea, I personally was looking for something like this in the past.
-Good layout.
-Background looks nice.

Cons:

-(Major) Iffy Navigational paths. Bots couldn't seem to make it up the second ladder without being downed from falling.
-(Minor) Few railings missing or off, some sections of the level should probably have some support columns underneath them so they don't look like they are floating. 

Conclusion:

Overall I really like this map, I can't wait to try this with some more friends.