Making some additional headway into the tricky portion of this project, a lot of it done with mirrors to see what I'm doing as I suspend myself over the mountaintop to add glue into crevices and near the track to apply the brown and green stuff. The first layer went down with nothing more than a coat of straight wood glue followed by the vaccum and then dressed again to get the coating I liked. Followed that up with a dribble of alcohol with a syringe and then a 50/50 mix of white glue and water (just like you'd do track ballast) over the new added material. When the green and brown stuff dries, I might add some areas of static grass on top as an experiment. They come shrubs, and finally trees. Here's a shot from the bridge end of the project.
Check out my "Rainbows in the Gorge" website: http://morristhemoosetm.wixsite.com/rainbows