Never got into the RC thing. Mine will be displayed in the living room if my wife can get over the size of the thing.:eek: This will take a while, so she's got time to learn to love it.
I posted some pics here a few months back of my "HO" scale Psycho Mansion interior in progress and like most hobbyists I like to have several things going at once. What I'm working on now might not be something your average railroader would include in their layout, but it is "O" scale and it is...
Landscape bark (nuggets, not mulch) simulates certain types of rock very well. Dry a few pieces at room temp, attatch with wood glue, blend edges with gesso and paint. They're also very lightweight.
If you can make a short section of railing you're satisfied with, you could try casting it in resin. Depends on what it's worth to you. I've seen some complete rubber mold and resin kits for around $25.
I seem to remember this method used on resin or plaster to make rough water. I can see where if you weren't carefull, it could end up looking like one of those old Star Trek sets (chicken wire+canvas+spray texture). Yours looks good, though.