Rennie,
That table in your post ends up being shorter than my cutting table when it's folded, but it becomes twice as thick when folded. Is your free space to store this more this shape? When I store my cutting table, it just leans against my sheet stock, and since it's both shorter and narrower than a sheet of plywood, it stores there very well. With that much 2 X 4 material in it, I'm certain that your table design is also heavier to carry than my cutting table, although the casters would surely help here. Version 1 of my cutting table was made with all 2 X 4 material, and as my knees deteriorated, before getting them replaced, I reached the point where it became too heavy for me. That's when I cut it apart and went with the 1 X 4 frame and only use the original 2 X 4 cross pieces in the center and where needed to attach the legs. My previously attached photo is of version 2 of my table, taken almost immediately after I finished building it after cutting apart version 1.
I wrecked my knees when falling through a floor while fighting a fire in NY State back in 1978. I fell about 11' and landed knees first on concrete. I built my cutting table after my knees reached the point where I could no longer get down on the floor to make the cuts on a foam backer. After both knees were replaced, my metal knees no longer have knee caps, and kneeling down on a thick carpet feels much like kneeling on road gravel, so it's even more painful than it was before my knees were replaced. They are just skin over the metal now, with no soft padding flesh in them at all. If I have to work at floor level now, I have to lay down, and then have a chair, door and door knob, or something handy to pull myself back up with. I can no longer squat down and sit on my heels like I once did to work low either. My metal knees won't let me bend them this far, and when I try, it is just too painful to continue.
Charley