Relic,
I have been going over every page of Jas.Howes Modern Gunsmithing in search of clues for an 03 that I believe he may have made. The one thing that really stands out about your rifle is the trap grip cap made from the buttplate of an 03 or Krag. It is explained by Howe in detail of Vol.2. Just a thought.
I would vote Dubiel as the stockmaker,but whoever did the metal sure knew what they were doing. Really nice rifle,did you get it, can we see more pics?!!!!!!