Ok, I have developed a plan. Simple to make and effective. I will cut strips of metal and lay them on top of the current flange. I will drill holes to create spot welds to weld the top strips to the current metal flange below. I will also tack weld the top strips to the vertical areas of the wheel house. Since the new metal will overlay the current flange, it will cover the rotted out holes, thus creating a new flange on top of the old flange. The new flange will be made from 2 metal pieces the shape of A. Also one long strip the shape of B. The opposite end of the wheelhouse will use a piece the same shape as piece A, but flipped upside down.
