I had a MOTU Classics Beastman without a head and armor and simply wanted to complete him. I have been looking for a suitable head and finally broke down and used a SOTA Streetfighter Blanka roaring head. It fit like a glove.
I removed Blanka’s massive hair and using epoxy, I sculpted the head to look like a really feral and ticked off Beastman. Sculpted the chest armor, including his pendant or talisman, and luckily I found some Beastman fodder piece for the arm armor.
A couple of dry brushings later and done.
For more info on this custom, check out the thread on the He-Man.org message boards here.