Seals = potential leaks. Not saying it can't be done, with tongue and groove or O-ring seals. But lapped or guttered seams, or post-tensioning would be my preference. A detail cross-section would tell the story.
Colonials prolly didn't use softwood veneer for flooring. More likely hardwood planks. I know raw veneer is a euro-scandinavian thing. Back in the 50s in the PNW they made veneer from old growth timber with really nice graining and then sand-blasted it to give a nice 3D texture.
Hemp is an annual crop so production can ramp up quickly once the artificial constraints are removed.
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