"I'm staying out of this one 'cos it drives you mad."

Know the feeling! ;) The Voynich manuscript is worse for that, though.

"Me? I'm still hung up on the shamanic, drum beating, teaching South American Wotan."

Yes, what you said there a while back sticks in my mind, too. It's intriguing, but again, likely to drive you mad! Here's some food for thought, though, a suggestion that the "new" world was known in the "old" world even before the Vikings (and of course there's always the Piri Re'is map, if you really want your head done in!).

http://www.forteantimes.com/articles/117_toke.shtm
(thanks to the person who sent me this link, btw - you know who you are)