Thanks for the link. Last summer would have been the time to try it for sure. Sounds like it could be multi-summer, miserable and fun adventure. Would for sure involve lots of logistics, gear/fuel caches.
I've got an idea for a minimalist raft that would float a person and a dirt bike, but its a little sketchy and I haven't tried it out yet.
I'll try to borrow and airplane and fly it and see if its even possible.