Walnut is worth hiring someone with a portable bandsaw mill.
"Year an inch" for typical air-drying. I'd cut it to 2" on a bandsaw,
because the kerf is negligible - you'd lose too much doing it that way
with a chainsaw mill. After it's dry, I'd resaw it on a bandsaw
again, giving me bookmatched panels.
Watch out for bugs during drying. Walnut (unusually for most timbers)
is prone to bugs eating it even when reasonably dry.
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