@Richie C. posted:I like Option 1 better, especially if you can design a crossover to move from one loop to the other.
For edging, I use a 4' X 8' sheet of thin 1/4", I believe, "luan" plywood which I cut into 8' long strips which are 8" tall (you can adjust to whatever height you feel you need for your layout) and then apply some semi-gloss poly. You can cut one in half to make the table ends. I nail them into the base with a nail gun using 1.5" brads or finish nails and then fill the small holes with wood putty. You can also adjust the installed height above the layout surface to whatever height you want. Mine is relatively short at about 2" above and is more for looks than to keep trains from flying off the layout.
Thanks. The original design from @Ken-Oscale for Option 1 includes crossover from outer to inner loop - I just deleted it from the track plan for now to save $400. 
But it can be added anytime in the S-curve areas in the middle of the layout.
I like the edging - thanks for posting.
