Here is another idea for you. You can replace the Atlas-O elevated loop with your O-31 snaptrack, which will look good for the elevated trestle run. And just delete the On30 line.
This version has a wide outer loop route of O-60, which will run O-54 standard trains, which is a nice feature on a small layout.
A five-foot wide table is going to be a problem with reach, unless you have space to have an aisle around most of the layout (2' wide aisle will be comfortable). This layout is designed to be on a table that rolls to pull out for access and construction, but otherwise can sit in a corner or alcove.
