How about this for storage/shelving?
I know it's a bit of a different idea but I made my bench entirely out of pallet racking. The racks above the bench will literally hold tons of weight, it's what they are made for. The racks were a couple hundred bucks off CL. I had them sandblasted and then I spray painted them. I can understand the appeal of the Levrack thing but IMO it might be less than ideal if/when you're dealing with heavy and/or odd-size stuff.
Please ignore the mess, it's a working shop.
This is just after I built it. Eventually I built a shelf across the whole length of the back of the bench.