LION says be careful putting that stuff closer to the tracks. Some finishes tend to shrink and try to derail the trains.
What is wrong with REAL ROCKS foy your cliff. If you dont have the right kind in your back yard, you can get some nice rocks from a landscaping establishment. Break them with a hammer (works best in the hot sun) and mount them on the layout.
That is what the LION does.
ROAR
The Route of the Broadway Lion The Largest Subway Layout in North Dakota.
Here there be cats. LIONS with CAMERAS
Nice idea if you can still find that old webbing, maybe lots of folks still have some stashed away.
I have used the sticky-back Fiberglas® mesh drywall tape. Not free but it also makes a handy support for plaster hard-shell scenery methods.
Thanks, Ed
Found a old package of chair webbing from the 70's in my garage. So I thought it would make great support for making hills. I wanted a gentle slope above my cliffs that have been blasted out for the rail lines. It was super easy to use' just a staple gun and scissors. Also free.