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Thats a pretty good idea, i thought of a razor case with a finsher built into the underside of the lid, and leather on the top.

Do the narrow ones help if you have a particularly warped blade?

Oh yes, and you could use bolts with wingnuts to tension the leather, i think lipshaws are a "bit" like that

Build them out with balsa to 7.5cm, perfect size trial with balsa only, then stick some animalbits on later :)