My favorite sewing room storage units are two architect flat files, 5 drawers each, stacked atop one another. They are each 3' X 4', are on wheels, and have a 4' X 6' cutting board on top. These shallow drawers are fabulous for thread - you can see every spool!, buttons, notions, interfacing, and especially my hand made patterns - little folding necessary. Although these files can be expensive, and heavy, most architectural firms are now storing everything on computers and may be looking to get rid of their flat files if you are willing to move them. You might put an ad in your local AIA newsletter or on Craig's list.