Good  information, Serge.  I've been meaning to get that book for a while, and now I'm sure I will.  
I wonder if the red scabbard and red handle have a special significance.  It is so often, but not universally, seen.  Of the two Kachin dao I have, the higher-quality one has the red scabbard.  I also have an old Shan dha the scabbard and handle of of which had been painted red (fairly sloppily, sometimes painting over the silver covering).