Yeah, well, my instructions are "basically" exactly what I did. I should go back and add onto the page about how after my first cut, the opening was way to tight, so I had to take a little more off. If you look at the last photo on the page, you will see that I ended up with about a quarter centimeter on each side and the bottom. This is needed because the black metal piece that holds everything together is raised. So you need to leave room for it. I know someone else on here (can't remember who) just cut holes in the top for the towers and must have forced the covers over the black metal piece, which as far as I can tell, would have created a helluva bulge and a lot of pressure. So, I opted to cut a slot for the metal piece. Cutting this big of a hole in the rail covers will make them a little weaker, so be careful not to muscle them to much. PM me if you want and I will send you a photo of the back side so you know what I am talking about there.
Biju, so sorry for the jack.
Bart
PS - 100% wear goggles! Splattering bits of fiberglass in the eyes is no bueno.