Came in a little Bit Late on this but, yeah the BH bio was sculpted based on a similar arc to a Biohunter Ancient Elder or Ruffkin Celtic.
The plaster armature was reverse engineered based off the Ancient Bio from print outs.
So far no Bio's of mine was sculpted on any mask armature cuz I found it a bit Impractical when it comes to molding,
but I may sculpt a BoneHunter 2.0 down the line based off dimensions of a DB P1 Gen 2 mask