I do not like the rolly shelves heretofore constructed by the others, so I made something accessible on all sides. I created only one solid shelf bottom, because I need flexibility of purpose in the rest of the structure. I wanted it stronger and lighter as well, so I made it a study in lap joints. It is very strong, rolls, and meets the size requirements.
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Note: I like it but Rolly Shelves are strong vertical storage with wheels to move around when necessary. You built a Rolly Platform. So the vertical frame you built to meet the height requirements is pointless. Also in the video it looks like the bottom frame scrapes on the floor a bit depending on how the wheels swivel.
Thank you for catching the wheel malfunction, I moved the caster around the corner and it works much better, as shown in the photo below, clearance is now uniform across the bottom. I included a photo of the full height of the rolly storage structure in use that includes two shelves (one on top and one on bottom) and one rack/shelf at about waist height, and a temporary drying rack on the left. It was designed with flexibility of function in mind because my shop space is so limited. This way I can set it up as a drying rack if needed, an auxiliary work bench (thus I used the casters that I did) if I unload the center shelf, or storage in between tasks.