Oh, how lucky are you? I'd put in cabinets or shelves on the walls with lighting underneath then put my tables under them. Have a U shape with cutting area, sewing area, and pressing area with a computer chair on wheels so that you can easily go from one to the other. Light colored walls will make the space feel bigger and also help with lighting. Get your favorite drink, a chocolate or seven, lay back on the couch, close your eyes, relax and picture your perfect sewing room---one that fits your every need. Then adapt as much as you can to the space you have. If you use flannel for curtains you can make them with no extra bulk, and put a rod at both ends. You will have an instant design wall without using up any storage space. You can also put up a section of peg board for hanging cutters, scissors, rulers, etc.