Kevin,
I tried to do the same as Daz. When you fold a loop and elevate the center it will block the view of rear of the layout on one side.
it's also not a good idea to have switches on grades. (The one on the downslope to the blue tracks.)
I elevated to the bridge to 7" and the crossover switches at the rear are on level elevated area at 7". The grades are 3.4%. Not bad.
I placed all of the blue track on the Track 2 layer to make it easier to work with and set that at -12(using Elliot's suggestion). I didn't do any more with that.
I also created a terrain polygon to allow for 3D viewing. It can be shaped or whatever. Just needed something for a reference.
My suggestion is to work on the main double loops first. Change the angle of the bridge and cross that to the rear of the table and move the rear level 1 tracks in front of it and rework the loop to fit. You could also keep it the same and put the grade up on trestles to open up the view. That may not look that appealing. Regardless, a switch on a slope is asking for a loco to flop.
