I think it is possible to build them Piece by Piece. But they wouldnt look good if you want Guests walking on them because you need to place a Path under them. I think something like a Null-Path would be good (just like the Null-Fence but as Path)
I was thinking like how every different path has its own "bridge" when you elevate it, have the natural pathways bridge be a rope bridge. But null paths is a great idea as well. Could use that for a lot of things.