How thick is your poplar, Devin? I buy a lot of ¼ and ⅜ inch nowadays because that’s about the right thickness for most of my boxes. But ½ or ¾ will be easier to learn on. For your kerfing plane, I’d think half-inch would be in the right ballpark.
If you’re aiming for this year, with your perfectionist tendencies, dovetails may not be best. Miters with splines will be a lot easier to get good and looking good. But don’t let me discourage your from practicing dovetails.
Thanks, Tom & Peter. The only real problem is that the kakishibu raised the grain, so I’ll need to sand it down and re-treat the wood. Dang it. Oh well. Learning as I go.