Hope you give updates on the progress of your layout over the next 10 months or so
Expect them!
I like the idea and the design, Stewart, but I'd go with O-72 or larger if the space permits.
I'd love to use a larger curve, but the area measures 64" deep.
one design point you might want to reconsider, using O54 in a climbing loop, you only have ~14 feet before the tracks cross yielding a grade in the 4-5% range which is quite aggressive for an outdoor layout.
cheers...gary
I've been kicking around some other track plan ideas that I may post, but this is the one I keep coming back to. I'll have to do a test build to see if the grade is acceptable.