Nice work! The Brennan view of the sniper was one of the first things that I wanted to see when I created my 3D model.
This would have been Brennan's view of the SE corner window.....BUT.... That is NOT the window where he saw the man in light colored khaki clothing who was aiming a hunting rifle out of a window. Brennan clearly said the man was STANDING ( he could see the entire upper portion of the man's body, from his waist up)
A standing man could not stick the barrel of the rifle out of the half open window and aim it as Brennan described.....Therefore, Brennan was NOT describing the SE corner window....