What would be ideal is if there is something as simple as the tiny book "Historic American Timber Joinery: A Graphic Guide" by Jack Sobon that shows pictures of joinery types and where to use them. As of now I am not seeing enough detail to fully understand how a structure is put together and with only sketchy German resources it is unrealistic to contemplate a build based on it.

And is it spelled Allemanic or Alemannic? Google doesn't like the former spelling.