Thanks Chuck,
I first struggled to figure out how the Haida managed to make such straight belly ridges and perfect symmetrical concave sides. Then it dawned on me that they must have made themselves a stone scraper with the correct shape to achieve that kind of symmetry (at least that's what I think). That led me to sacrifice one of my paint scrapers I normally use to finish the tillering of my bows and file in the shape what I wanted. It was a bit hard to keep the tool sharp but it worked otherwise really great.
By the way I really like your HHB bow as well you have just posted. I have asked you some questions on heat treating and recurving the bow. Would love to keep in touch on the topic since I would like to try this myself.
Cheers,
Phil