Super-early map screenshots... thoughts?

[Tsukasa]

Screenshot of my map:

http://www.flickr.com/photos/23507018@N06/2243298703/

Here's the source image that I am using for reference:

http://flickr.com/photos/staylor336/1032837271/

Also, I plan to work this room in:

http://flickr.com/photos/staylor336/367227148/


As you can see in the screenshot, most of the basic blobs aren't even done yet... but...

My question to the FF community is how should I design the gameplay for this map? Should I clone the train building across the tracks and work it that way? Perhaps the huge open nature of this map is better suited for an AvD? Please, suggest away, I need some commentary in order to form an image of the completed map in my mind.