Well hunters do survive a lot in the wilderness so I would assume they are good at making things with raw materials. How did Kabr get into the Vault of Glass alone if it takes at least 3 people to open the spire door? Unless they just guarded the 2 synch plates(Kabr with Osiris) on the sides and shot the stray pretorians that went to the middle. (pretorians hardly go to the middle plate.)