When my shop did the Traxxion front upgrade they said it was quite a job. That's shop talk for a mo fo sob. They though about turning the whole bike upside down.
I test drove a K1600B and it was a slick machine but we really did not have the room or $ to add another bike. I did have a desire for the SF but thought Vintage, a CDH, a Chieftain Elite and two RMs were enough Indians for one garage.