Dude, that was some awesome freehand work. I was just thinking of trimming mine. I installed some 7" wide ones after I upgraded my wheels a few years back. I have been getting sick of the current look and I came across your thread and was impressed with your work.
Unfortunatly, I am all too familiar with my freehand work and I personally would not attempt this myself. I do however work well with tools and machinery. I am contemplating a way to use a router with some sort of a guide or "jig" to assist me with a controlled cut and achieve the desired results. I just had to compliment you on your great craftsmanship. My hands aren't as steady so I will be looking for a mechanical aide to steady the router.