Congrats on a great set up. Glad it finally arrived to it's destination. I know you were fretting over it. As for the s-biners, that is how they are used. Not sure which ones you got, but I would have used the small stainless ones. I had two on order, but I misplaced them and just made me some soft shackles to use the same way.
Enjoy your trip and shoot some pics if you get the chance.