Coming from me this is pretty impressive but I think you may be over-thinking (aka over-engineering) this whole rope thing. Though it may not seem from my posts, I'm in the "kiss" boat when it comes to implementing things. Your supply list of rope and cordage reads more like someone headed to do some caving rather than even a extremely remote trip on a boat. I agree with the previous poster that rope failure is almost NEVER the issue. It's the knot, the anchor or the boat connection.P.S. - I notice that the "cable rope" I have, is made of Dyneema and is designed to be a replacement for steel cable on winches. It is a braided rope, light weight, and I originally thought it would make a good anchor rope - but it also floats and is a very static line. I'm not sure what might be a suitable rafting use for it except to make attachment loop points for other rope attachments because it is incredibly abrasive resistant; however, it is takes specialize knots or metal type steel cable bands to secure.