I think this plan has a little more interesting operating, as trains have to go up and over. I was thinking to two trains operating on the mainline and maybe switcher for around the yard.
Minimum is O72 with O84. Scenery....well, lets say very mountainous terrain.
Grades should be OK( 3%?). Atlas TT and two roundhouse kits(I had to do it)
I have some of the other plans that evolved from my original pretzel layout to this one, I case anyone would like to see them posted.
I will see If I can post my crappy basement plan as well