For a pop out or cantilever where an existing window is (approx. 2010 mm x 1500 mm) in our main bedroom, just tucking it under existing eaves but maybe lengthening to about 3500 mm wide, and using the eave as the roof (in cheapest materials), can you give a very rough estimate of cost? Trying to widen the room so that we can make our existing 3 door (hinged doors) wardrobe wider as well, to possibly be a walk-in robe. Thanks. We live in the Illawarra area (NSW, 2500). Thanks. M