I wonder why a lot of manufacturers seem to put the valves right where the perimeter line will go. Is there any reason in particular? It seems like the perimeter line just gets in the way of using the valves, but maybe having the bowline over it is some sort of extra protection for the valve? Maybe just to have them out of the way and not be too much on top of the tubes? It's definitely not just your boat, I've seen it on all sorts of other rafts.