Maybe take one corner and make a small enclosed area with furniture (maybe 6x6). You could put your ironing station against one wall so it would be away from the opening to your area. Use a child's gate between the furniture pieces to block the area when you're not in it to supervise. A friend uses an old dresser for her cutting table and then she has all the drawers for storage. This might work for you and then find an old desk for your sewing machine. Use both these pieces to enclose your corner with a small opening. I hope this is clear and helpful.