That looks great Alan!
I haven't been working on much scenery, but as part of my signaling project, I am trying to scratch build a Conrail-era signal bridge with PRR-style signals from Custom Signals. My inspiration was the WB signal bridge at ALTO in Altoona. The build from Plastruct parts was not terribly difficult, and Dave Minarik fabricated custom railings and painted & weathered it for me.
My biggest problem was that the attachments I made to mount the signals weren't sturdy enough and the plastic joints kept breaking. So, with Dave's micro-drill bits and some metal rail spikes, I was able to sink metal pins through the supports to the structure and fill the holes with CA. So far, so good!
Here's the bridge with supports in black. I re-sanded and re-glued each in place.
I drilled holes through the base of each, filled with CA, then inserted a small metal spike to give the support some "roots"
After the glue dried, I attached the three signal heads, and this time, the supports didn't crack & break. Of course I'll need to hide the wires, add some additional railings, and touch up some paint, but at least I'm making progress.
The photo in the background is from Conrail Central Region volume II by Steven Timko, and shows the type of signal bridge I'm trying to model.