I had to give this a go!
I got the idea for making wooden clamps whilst I was researching ways of making a c-shaped frame for an up-coming digital caliper project.
I came across a number of posts on the internet where people have been making clamps very similar to the plan I mocked up above. In my last post I showed you my experiments with comb finger-joints created on my table-saw. Rather than to jump right into my caliper project, I figured that I'd explore the concept a little more by making some clamps. The clamps I ended up making are pretty much to the spec in my plan above.
In other project news, I thought of a little innovation to improve my spool clamps. Look at one of them here fitted with a fat straw over the bolt. I don't know what you call these type of straw, but I've seen them go by "bubble straw" and "boba straw". The key is that they're wide enough to fit over the bolt to protect whatever you're clamping from coming into contact with the bolt thread. I don't know how good this will work, but there you go... the mind never stops thinking ;-)