Terraforming at 75%

Now that I'm fairly confident about how I'm going to model the water for my Dave Brewer challenge entry, I've started work on the basic terrain of the final model. So far I'm at about 75% completed.

As you can see, so far I've modelled the river bed, with a drop for a small fall, and the left hand bank where the railway enters on top of a rock. The right hand bank, although taking up a smaller portion of the diorama, is more complex as it contains a man made embankment for the railway to run on. I have some ideas of how I'm going to build that up, but it still requires a little more thought before I make a start on it.