This looks terrifyingly difficult. We have long races out here in South Africa, but nothing of this magnitude. That's a crazy distance, any idea how long you think it will take you?
And then on a fixie, this just sounds like masochism if I've ever heard it :)
Only kidding man, I envy your ability to put yourself through long hard hours on the bike. I think my limit is 6hrs, then I would rather be anywhere else.