Basil,
I did like you, only I had O-31 track and since the metal ties on them is black, I stayed with that theme to make them uniform. I used wood window screen framing which is easy to come by any of the box stores and is the same width as the metal ties. I used this tool to cut the wood framing
I like Joe's Wenge wood, but I made my own trestle using the same ties. I actually like the look since the metal ties still blend in with the wood ones.
Keep up the good work It will look great.
Rick