A map of the project is here:
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www.flickr.com]
and while this amounts to about 1100' of "mainline," (each city block is 300' long, cross streets 80' wide), not including engine house leads and connecting track to the D&S, that's enough room to play around somewhat but I wouldn't think for serious running. There will be car storage using some of that track as well--the D&S cars on the Shenandoah spur need to move somewhere so the 315 can access the main line of the D&S, so those may end up on some of this new track.