All:
I have not forgotten to post some more info on the system I am building. Time has been short supply for such things lately.
I did have a chance to upload some videos of my old Pennsy-based system from 2007 or so. The wire and immediate supports were modeled after the old Pennsy main. The extended supports were, well, practical at best. The system started as a single track O27 pastime. It morphed into a double-track O27/O42 monstrosity. It wasn't well planned out, and crude in places. Life happened, and that system is only a memory. I'd like to think the new system now employs all the lessons I learned then, and is a bit more elegant.
--NMM