Have done two of them by cutting the tub at the seam and then trimming over to the frame rail and essentially just extending the stock tub over to the frame rail. Once done and cleaned up and painted, a chevy or ford guy looking at it wouldnt know it wasnt factory. When doing this method you dont have to do anything near the fender and no body work is necessary. If interested can get some pictures, etc. and give you a little more detail on how we did it. The seat frame does have to be modified somewhat.