This is the site context model I have been working on and will continue to work on.  It is a work in progress.  I apologize for not having images from when I started.  It began as two series' of sections through the city.  Each were perpendicular to eachother.  So I had a grid across the city.  I then placed paper mache over the grid to get a surface.  This way I was able to get the surface relatively close to the topo map.  As you can see now I have plaster over the top.  Eventurally it will be nice and smooth with some surface buildings.  The scale here is very small, 1" equals about 250'.  To give you a little more perspective, it is just short of 2 miles lengthwise.  From the lowest part of the model (about at my site)  to the top of the hill is an elevation change of 650' just short of 3".