The diagonal brace is likely overkill and will get in the way of accessing the underside or a shelf should you choose to put one in. The whole bench will likely slide along the floor before it racks should you push hard enough.
Just writing so that other bench builders make that consideration not to shit on your project.








You should be wary of giving universal “bad idea” advice for under bench storage. I have a split top Rubou with a cabinet underneath that’s worked great for over ten years now. There’s enough room between the top of the cabinet and bottom of the bench top to let in a clamp head.