I was checking to see how a 3/4" dog hole would look in a vise jaw made from two 3/4" pieces of plywood. Just clamped for the test, but would be glue for the real thing. Interesting to see the hole opened up. And luckily no splitting, but do you think it would work as an actual vise jaw? This is for a Veritas quick release front vise, so the jaw is only supported in the middle.
Depends on the type of work, but you may want something denser down the road if you find you’re cranking down on a narrow piece and it’s flexing. Even something with more plies like Baltic birch might give you more mass, but I’ve only ever used hardwoods for my vises so can’t say for sure.
Also recommend those cork/rubber jaw liners for added grip.