The way I do it is completely not traditional and used 1/4 elastic cord (which many people hate). I drill a hole in the gunwals and thread a loop of paracord and tie a knot on the inside of the gunwals. Each loop is one attachment point. While the boat is getting skinned I poke the paracord through the skin without making a hole (the weave in the skin separates enough to allow it through). To do this I loop some sinew through the paracord loop and then use the sinew with a needle to poke it through where it will end up when done skinning and then use the sinew lead to poke the paracord through. Cape Falcon Kayak's technique of pre-lacing the skin on is neccessary to get the placement correct. It all gets sealed when coating the skin.
The grab loops are just a peice of paracord through a hole running all the way through both gunwalls that is tied into a loop. To finnish my rigging I made some slings that fit inside the elastic to hold things like a full size nalgene in the front. Sewing is required to make the slings.
It works for me because I prefer elastic and don't want to melt holes in the skin. Unfortunately, this technique only works if you plan before you skin, which may be to late for you boat.
Scott