We currently have a 9 foot sliding glass door that we would like to replace with windows. The room is 20 feet long. At 7', there is a 4 foot beam supporting the metal beam in the ceiling, so we have to take that into account. Also, my husband wants to be able to put a couch against the wall and doesn't want the windows lower than 32 inches. Any thoughts you can give on window placement, sizing or designs would be appreciated.