I understand where you are comming fom when it comes to wanting to do something big. I also have some big, BIG plans for in the future. my reasoning behind wanting to do such a long odyssey are first, to shatter the limits of what seems possible, and to do something never done before. also, when doing such a long trip, you learn things others are not able to, you adapt and grow mentally, and are able to share your experiences with others. you are able to see more, do more, and within a shorter period of time.
a double yo-yo, is nothing I have heard of before, and I encourage you to try for it, are you planning on trying for any sponserships?
I would be interested in what kinds of gear you will be planning on bringing.
I hope it all works out for you, I still have quite a few years before I would be able to embark on a long expedition, I hope that my dreams dont change, and I am able to put my mark on the outdoor world.