Awesome work, Steevo! I just picked up one of these chests, myself, then found your thread. Perfect timing because I'll be building some workstations in my garage over the winter and spring. Might have to piggyback on your ideas a bit! Why reinvent the wheel when you can spend more time innovating on how to make it rounder?!
Based on the pics, it looks like you're going to mount the bench tops well over the flat top of the cabinets - maybe about 1-2" because of the rolled lip that juts up around the sides and back of the cabinets? Are you going to do anything with that gap? Hinged tops? Special hidey-hole for flat tools? I've been debating on what to do with that area.