Thanks for this cool story. The core long-term members of the NPS Historical Projects crew are known in the Denali area for doing quality work, and this is a great project to read details about. Harry Karstens is one of the most fascinating and Alaskan characters in park history. How cool to learn that he built the cabin from salvaged materials, like so many others have done. (And, I highly recommend Walker's book, TheSeventy-Mile Kid, which the author cites.)