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Peter....I want buildings too... Lee
Just my two cents at this point, I'd go with a diamond in the middle instead of going up and over.
OK, cutting the minimum radius down to 9.75", we can wrap a line around the outside to gain elevation for a second level to some urban trestles, give you a "branchline" including coal trestle, and provide a connection for staging all at the same time. As it is, the grade (dark blue section) is 2.5% to reach a 2" elevation. I believe an over-and-under arrangement could push the grade to as much as 4%, and result in nearly all of the mainline being on a grade. (And as much as I like over-and-unders, given this size layout, I think it would look a bit too model-railroady.) So, IMHO this might be a better option.