The Tribal protion of the game would be the best for any type of crafting. Since your much more in depth and personal with a small tribe. Maybe the AI will pick up on how certain items are being made and go out and do it themselves.
"Hmm, this spear(player-made) was made with a 2 rocks, a stick, and a bit of vine."
*2 rocks, a stick, and a bit of vine later*
"Ga ha! Now we have two spears(one player made, one creature made)."