For a Japanese pull saw, I would have thought that support on the near end of the jig would have been better... but then I'm far from a handtool officianado. Is there a reason why the base board being so wide? I'm guessing its your comfort zone and that with orientation you can see the markings for the different lengths, with my eyesight the focal length would be a challenge, exacerbated by my short(er) arms.
This jig's cutting slot is exactly a match for my extra fine dozuki saw. The kerf is exactly 0.3mm (0.010").
The one I made years ago was not the showpiece like yours, but was a tad fancier than what I have now. Either my handtool skills are badly lacking or my kakuri was a dopelgagnger made in China, but as with my current one, the kerf keeps eating too much sawdust and widening at the girth requiring a new kerf cut or a quick dirty remake from whatever scraps I have. I have found that placing the dowel on the near edge, a single pull of the kakuri will sever all connection.
If your first cut is too short... Take the second cut from the longer end... LBD
