Great idea with the vise feature. Please let us know how it works for you. Love to hear more about your purposes for your bench too. You can always make a different bench with a solid top if you have the room. I used a 1/4" Hardboard over 2X6 for my bench top; painting it white. Makes for an easy job to freshen it up every so often. The Hardboard can really take a lot of abuse. The painted white surface just makes it easier to see everything.
"Even bad decisions make good stories"