in that case, it's ever more impressive ! i don't know at all how posemixer works, but your mesh must be simple enough not to get messy in the cube version ? Displacement maps as a bonus ? (or still wrong ^^)
No displacment The mesh is complex as you see, but the cube version (=state 2) is created through modification of the original mesh (=state 1). "Modification" means here: moving+etc. points/polygons/edges without deleting or adding geometry (if, Posemixer would create a mess).