Ok, I scrapped any previous designs and started completely fresh. I changed some wants based on being a little more realistic for the space, while leaving enough room for scenics and industries.
This new design utilizes some inclines to get me up to 6", which ends up being a 3.1% grade, which will be fine for what I'm planning to run. (Already tested with an even steeper grade). So I'm able to get the second level I wanted.
No reversing loops, but I was able to fit in a reversing wye, which may lead off into the adjacent office some day.
Light green is my uphill grade, and light red is the downhill grade. Dark green is 2nd level. I'll have a tunnel in the southwest corner, and a bridged section over the southeast tail off the wye, and a removable bridge section in the middle of the aisle. Still have some tweaking to do, but I feel like I'm getting closer...
Below is an additional version I created, which has a full upper loop too, so trains can stay on the upper level. With this version I lose a little between the lower sidings. Thoughts or opinions?