I really like the original and track going under twice...but the other way does improve the grade. It also lengthens the run. I understand that the turntables do take up valuable scenery room, but they help with reach.
If you do end up looping, on one end or the other, or both, do your best to plan how you will visually "divide" to get away from the looping toy train layout look. There is nothing like that in the canyon.
I don't know what your skill level is in regard to "pop-up" hatches, but that would be a good option for aesthetics and accessibility.
I like having a "continuous" option, but in your area it just eats up so much space. I think a turntable would be super interesting and impressive in the lower area. Up to you? You've got a million and one things to decide! I'm curious to see what you'll do. I know you are too. :-)
