Wagon Vise Design

Based on sage advice from friends, I bought soft maple for the base of my bench rather than poplar. I wasn't able to get 16/4, so I'll need to glue up some boards, but this is a much better choice in the long run.

In the meantime, I came up with what I think is a good design for a wagon vise. It's one that I can add to the thick-slab benchtop anytime and requires no hardware, just some careful chiseling.

I believe the single wooden screw with handle will provide enough pressure.  I've never had to tighten the vise too hard to keep a board immobile. In fact, clamping too hard can make a board bow.

But I'd like to hear what you think.  I've been known to be persuaded by wise counsel.