Well i’m about 60 percent done now, and things are going nicely. I started by cutting out the shape, dropping it down to be the river bottom, then forming the banks.
Then i added plaster cloth and a finish coat of plaster. I used a retaining wall set that i carefully cut from behind with a razor saw. Just take your time and it cuts very very well. 
Then it was a base coat of acrlic earth, and painted the abutments. Detail work is starting now. 
All the while i was building the bridge, as you can see the bridge is pretty much finished, needs stain and a center support built next. 
So this is where i am tonight, no not all things are perfectly prototype, but this was supposed to be fun so i addlibbed a bit. I will post more later as i fini***he scene. Enjoy. Bill


