4 Runner looks awesome, I did the same thing with my rear fenders by trimming the outer skin then bending the inner fender up and welding it. One thing I have found though is if you hit a rock or tree in the fender area, it tends to pop open or peel apart. I fixed my the first few time it happend, but have recenly given up fixing it since it is a PITA. You can also apply some automotive panel epoxy to the seam on the inside to help hold it together.
