I think he was talking about the CP top being held onto the CP box.
I used 3/4" velcro all the way around and it is totally secure. I know others have used it with good results too. Its actually pretty hard to get the CP top off with the velcro, and I end up having to stick something in between the layers and sliding it to break the seal before I can lift it.
I thought about the hinge rout, but it was just one more thing that I would have had to lineup and drill for, when the velcro was a very simple solution.