This is a bit thin for an opening post (OP) traste.
I'd suggest that you show how you connect the anthropologists inferences from known facts about human designers and their tools to an unknown designer.
You also need to answer the question in:
Distinguishing "designs"
Since the design of a stone tool is of an utterly different type than a living thing. In fact, living things are proof that they were not designed intelligently when compared to evolved 'designs'.
If you haven't read the other threads on intelligent design on EvC then you are probably not ready to support your conjecture.