Here’s another box I made. I got the stone from a Canadian dealer, he claims it’s Novaculite, of the same type as Arkansas stones.
I’ve two reason why I didn’t add end grain blocks, one the dealer chanfered the corners of the stone so a block would not mate flush with the stone, and second the wooden blocks I used to make the box weren’t long enough. The stone is wider on one end than the other, but I managed to get a good fit, the lid goes only one way.
It’s a hard stone and I use it sometimes to refine an edge, I don’t get remarkable results, so I don’t use it very often.