Concept/Idea/Vision : I pretty much picture it a slums/destoryed city scape, probably pretty close to some HL2 areas. It should have 2 mechanic shops on each end with a large courtyard in front of each shop for forts area, then the buildings-streets-buildings. Maybe a Fire escape or 2, couple junked out cars, mail box(one of the blue postal ones) and a few other moveable/buildable objects(for the sher pleasure of making a wall made out of a mailbox :P )
also see 2 or 3 of the buildings as shown above having corners or parts of the walls missing, making several additonal pathways .. could even have the main buildings be intacted(thou probably junked out) and go 2-3 stories high ... a underground area, most likely a sewer style system would be a nice addition
any thoughts/suggestions/questions ?