i want to add an elliptical window on the back wall of this room i also want change the ceiling so that instead of a vaulted ceiling i have an elliptical shaped ceiling to match the window the window will sit inside each side wall by 30 i want the same 30 from the side to track around the top of the window as well and remain consistent around the entire window i want to maximize the height of the window and elliptical ceiling pushing it as high and as close to the vaulted ceiling which is the roof line as possible if you see the reference picture in color you will see the deminsions of the room total width 16 1 total height at sides of room 9 3 total height of room at peak is 13 10 the room is 24 deep i would like to see a steel window on the rear wall and plaster walls and ceiling