This map has a discussion topic which can be visited here

ive changed the design completely for this map, and only done a small portion of teh centre. the rest is still 2d at teh moment
self enclosed sewerage treatment map
only the most basic architexture (layout wise) is done
revamped the concept, reason for the 10%
-y is its working title

Am currently working on this map- download wont be up for ages