I had an odd assortment of boxes, plastic drawer units, etc. in my studio so I decided to get a better organization system. I put two of these together yesterday. They will fit under the cutting table extensions. The storage boxes that are about 14" square fit perfectly on the shelves but I think a lot of my other containers will fit well too. I will pick up a couple more of the square containers when I see them on sale.
I never did get to the sewing machine yesterday. I did laundry and some cutting but that is it. The assembly on those shelf organizers took almost three hours for two of them. Of course the second one went together much faster than the first one.