Here is how I attach the support webbing to my hammocks. As you can guess it's pretty easy. Just fold the hammock ends, tie a loop in the webbing, lay the webbing on the top of the hammock and and whip it all together.

Usually the first time you lie in it it will pull down to the knot and stop. I have never had a whipping pull off.

There's really no advantage to it except aesthetic and, maybe, you can use a couple of inches more of the hammock body.

The photo above was one of the first prototypes, now I use the full webbing with no sheet bend in it. However, if you used the double ring attachment you could do it this way and leave about twoo feet to attach the rings to.