165mm nakiri, came without a saya and blade is too deep to fit in my knife block. I have looked at both a 3 layered method with a sawed out outline made in the center piece and the (apparently traditional?) 2 layered method with a pocket for the knife chiseled out of the inner faces of the layers. I don't have the cranked handle chisel but might make do with other tools... What is recommended? The 3 layer method could come out a bit thick, the 2 layer method will be a lot more time.