Tidbits from the Tremaynes: What My Boy-Toy Will Do For Me. DIY: Lumber Storage System Tutorial ~ This is awesome! The slots allow you to organize horizontally & vertically, keeping lumber off the floor & similar lumber together & it's on casters!
Lumber and Plywood storage, not to bad of concept except it looks upside down to me. I would make the top the base, sheet board holder to base, hinge it to tilt out on to legs and have shelving open for front access