Your sewing room is almost identical to mine complete with the folding table. My closet is a bit more crowded and I have a bookcase instead of a dresser. I have considered putting a board and "piano hinge" on the wall above the bed mounted at a good cutting height. Fold out legs for the front. Keep the bed. When DS needs to stay there (when we have guests) hook the board up by the ceiling so it won't fall. The bottom of the board could be a beautiful fabric or even design wall. I have also thought about taking two headboards and making a sort of daybed out of the bed and doing the same thing but letting the posts of the bed be the support.