We're remodeling and adding on to an old farmhouse. We're adding a 2 car garage with a bonus room upstairs. There will be 2 dormers in the North slope and one on the South. The interior measurement of each week be 5'9". The contractor had originally drawn up plans to put in 3x4 windows. I would like to revise to a 5'x4' double window. My thought is that a 5' window will fill the space and look nicer, while also letting in more light. Is there something I'm missing about putting in a 3' window instead?