Hi Mark,
I couldn't help trying a couple of different approaches to John's design that might better fit your space and desired operation. See what you think.
NOTE: I updated this based on the changes you emailed today. (I should have noticed that and moved those upper spurs to the outside. 
)
)I replaced both turntables with reversing loops to allow for the placement of buildings, trees, mountain, etc. For example, you could place a logging operation in the top loop, then paint a logging truck coming down to a loading platform on the wall. There are ways to use trees and other landscaping elements to make it look like a train with empty cars is arriving and a train with full cars is departing. A mill would be located on the upper access hatch and a lumber yard and other building would be in the bottom loop.
I also changed the lower loop to make it look smoother, moved the lower loop to eliminated tracks crossing over each other and added a possible hidden staging yard (pylons are for visibility).
In the first example, the yellow track is at 8”, the blue track is at 0" and the purple grade is 3.3%. The red dots denote tracks that need to be cut. The staging yard is optional and can be deleted simply by replacing the switch and make-up curve with a full O42 curve. Even though this doesn't have a passing siding, it allows more space for landscaping the incline with trees, etc., like the magazine photos you emailed.
In this 2nd example, the yellow track is at 7”, the green track is at 2”, the blue track is at 0", the longer purple grade is 3.6%, the shorter purple grade is 3.3% and the passing siding has been included. The entry to the staging yard is kind of curvy, but backing in would be slow, it can be straightened by altering the bench work a bit and cutting the transition track coming off the switch.
