Reply by rustynails

I would not build in a tool well but instead make one that slides/attaches under the top. So if you need one you just slip it in and if you don’t need it don’t attaché it?
Make the well the same thickness as the top then just attach two long pieces of wood in the middle of the well sticking out the side , then make two pockets /brackets that would accept the long pieces of wood. Slip the well off or on as needed. That way you can clamp any were on the bench.

Good luck