My storage system has just been plastic stack drawers that I try to get when I can find them on sale. I use them as the base for my pressing table. The top is again plywood with cotton batting and muslin stretched over it and stapled on the back. I removed the closet doors and added boards for shelves and more storage bins. An empty dresser and two night stands stacked serves as extra storage.
My biggest challenge was for a sewing table. I had a folding table just the right height but I wanted my machine set down in like a "real" sewing table. We went to Lowes to find some 1/2 inch wide smooth wood. We couldn't find anything suitable, but it was suggested that we as in floor tiles because the boxes had smooth boards in the top for shipping that are thrown away. We found two that were perfect size. My husband traced my machine and cut a hole in both boards. Then we glued them with wood glue. A frame was made using 2 by 1 inch wood. Finally a notch was cut in the frame so I could load the bobin without lifting my machine. It may not be fancy but it sure works great.
My design wall was made with white flannel over fiber board.
The last wall of my studio is where my daughter's sewing machine is and of course a few more storage boxes. You can see the corner of my pressing table on the left.