re: Spline material

ChuckV - the word "splintery" is a better one to describe my concern, and I would likely put oak in that category. Not sure if white oak might be better in that regard than red oak? For lighter color options, I've only used basswood and then on the latest box, maple.  I may try some white oak on a test piece to see how it works out.  I do like the idea of a more subtle look with the walnut.  Plan to use Odie's for the finish which will give a deep richness to the walnut.

The differing spline sizes are a nice look on that box (and really like the lid).  My wall thickness won't allow for much variation so will likely keep consistent for this project. Will tuck this design feature into my mental files for the future.