Of course, I would certainly affix the tusk slivers onto a leather base thick enough to pass on its own. My only concern is that with the placement of the tusks, and the wool backing between the tusks and the leather, the leather itself will not be visible. Is this an objectionable violation of this guy?
3.7.2. Composite Armor must be identifiable as Armor by appearance.
I know the helmet wouldn't really be composite armor, as bone/ivory isn't armor grade, anyway. It just feels like I should ask this question before I dump money into it.