Glass kitchen Niche using old sash window opening

Glass window Niche Created from an old widow Sash fomr the 20"s now used for crystal glass display with back lighting Small Kitchen with old 1929 sash windows backing up to a porch addition from the 50's. Client in need of a 2nd bathroom, More kitchen storage primarily for crystal glasses, laundry room and beds for 3 small children who visit every few weeks