Thanks, Helena, Montana. Your concept is where I started about 10 years ago in developing the only self-stowing raft entry ladder. Rafters are so inventive and self-sufficient. I run into this every day, "What I do is...." Yeah, I used to do it that way, too. Time is too short for me now. I do it better than I used to. Here's what I do now after 5 years of development and 13 years of field testing:
Clearly I design machines better than I do videos. hahahaha
You ought to mention in your clear and well illustrated description that not all bungee cords act the same. Some might not work as required. Consider elongation, retracted tension, extended tension, lifting power, diameter and so forth.
Maybe I'll improve my design based on your suggestions. My patent will still be valid.