look into the chair lift thingy for the stairs, and have an old fashion dumbwaiter to set things in that need to be hauled up and down instead of using the stairs. Easy Peasy, and you don't have to pack up your fabric
I've had two friends put in the stairs chair lift and it added years to how long they could comfortably use their upstairs and basements. Would be WAY less than a whole new room, unless money is no object. Only you know that.