Great news!! I think I met you outside the BMW shop a couple of weeks ago. I was on the very tatty English 1100GS having just towed my buddy`s very broken 650 Dak from the Yukon crossing.....
Great idea because the Fairbanks BMW shop is one of the worst motorcycle shops I`ve ever had the misfortune to have to deal with. If you don`t have an HD there, they are utterley dissinterested and when they can be bothered to help, they charge an absolute fortune!! Luckily, we found someone else for tyre changes before going to Deadhorse.
I`ll be back up there in 2011 with a few Brits so I`ll be contacting you before then. Good luck with the project and as mentioned, a few BMW final drive seals and bearing would be a great stock item.