About the truss rod and relief. You are over a thinking this. If you use straight grained and dry H mahogany for your neck and a typical profile and no truss rod and the then work the fingerboard dead flat, the strings will pull the neck into the closest approximation of the ideal relief 99 times out of 100. It's all part of the design concept.
My ideal for classical action height approximates steel string Bluegrass action: just a hair under 3/32 x 4/32.
I often do use carbon fiber in my classical neck, but I then have to create the relief.
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