This is the Etna-Allison Park segment, with Pine Creek winding through the scene. At the right side of the image, I'm hoping to recreate the Bryant Road area, a somewhat iconic scene on the P&W. Here's a Google Earth image of the area:
Here's an image from track level:
.. and on the model from approximately track level at the same location:
It needs a bit of shaping of course, the hills will be more rounded and flattened. And covered in trees of course!!