I hope I don't come across as a Debbie Downer.....but....having fiddled with several concepts of different kinds, sometimes just in my imagination, other times dabbling in it on a layout construction. catenary is one idea I feel I had to let go. I'm into my fourth layout construction, long since at the fiddling/refining stage and still adding the odd tree or structure, but I have been running trains for years on it now. I know me....well...and I have to be extremely careful not to knock over things when I'm reaching well into a layout. This means trees, utility poles, and....catenary structure. I don't intend, or desire, to be the one to dissuade you from building a catenary, but please give it some sober thought....it WILL become an impediment to your enjoyment at some point because you are almost certain to dislodge/bend/destroy part of that complex and intricate system one time...and that's all it will take. I sincerely hope I'm wrong, and I would love to see you running trains exactly as you imagine doing at present and showing me I'm mistaken.