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After about a month of messing around in CAD, I came up with this variant on the old Gulf Summit layout from an Atlas book.
All tracks are flex, Micro Engineering Code 55. Switches and crossings are to be hand-laid.
Green layer is elevated, 1" from midpoint, allowing for 2" bridges and tunnels.
Steepest grade is 2.2%, but thats hidden in a tunnel. All visible grades are 2% or less.
Things will probably change a bit as I actually start building the structure and laying down foam.
Any thoughts/feedback?