I was not overly impressed with this thread when it started. The original poster held himself out as a purist and how steel tools were not as pure as stone tools. And then he stopped posting right after Gun Doc pointed out his love of artificial sinew in the post immediately before he posted how he was "too much of purist to hear the word varnish on a primitive bow".
This whole thread was his uninating contest, wherein he picked and chose the rules himself. His username TatankaOhitika translates as "BuffaloHeart". I could be wrong, my Lakota is very limited and rusty. Those now famous horse bows of the Sioux were most likely universally manufactured with the steel tools he decried as not primitive enough. (And for all his love of bendy handled bows, a 5 curve really doesn't bend in the grip!) Knives, hatchets, axes, rasps, files, etc are all documented trade goods that the Plains Tribes highly valued. If you are going to be a purist, be a purist with some semblance of historical acuracy.
Note the original poster didn't stick around long and never posted a single photo of his work. He posted from May 4, 2013 until June 3, 2013.