I bumped up the cost of the two spells from 50 GP/HD to 75 GP/HD, and added the skill-rank requirements as Components. 14 for Corpse Ripper, 20 for Slaughter Ripper.
EDIT: Also figured out the HD minima for the various sizes of Anatomical Juggernaut. Goes from 1 for the Fine and Diminutive ones to over 219 for the Colossal ones.
EDIT^2:
Originally Posted by Icewalker via PM