Update - Just thought of a theme and starting the gray / orange box version. It is going to take place in an under construction suburb neighborhood, where terrorists are trying to blow it all up for some reason.
So far, I am working on the layout. It will be a relatively small map (Possibly 3000x3000), which makes more fast paced gameplay. I'm sort of following 3klikphilip's approach to mapmaking, focusing on the funess of the map first. I'll upload some pictures soon.