... and if you build a only wood wheely with stone tools this could be considered primitive?
So the variables could be
1) materials of the finished product (bow, string,arrows, quiver..)
2) tools used to make it
3) building techniques, item design (what if you make a flemish string out of rawhide strips?)
4)religion, spiritualism, belief, superstitions? I bet in the past that played a big part in the construction of this weapons. I doubt that a beer, music experience could be classified as truly primitive
In my point of view "primitive" is often very close to the "replica" concept
We all agree that a replica is not 100% identical to the original
there are always adjustements, compromise and approximations
I'd consider primitive enough (not stating that is correct, just expressing personal opinion) when conditions 1 and 3 are met.
I also like to use self collected materials but this is an obsession of mines