They cost money to shape them into the hood line. Cutting is fast and simple. Figure 5-15 hrs per side to blend, not to mention welding up the seams.. Been there, won't do that again. Remove the paint in the rail and then check for rust. Prime and topcoat and after a few days fill with seal filler . Wait a week and touch up with body color. The water runoff from washing the car or rain itself always makes an interior mess.