On the Capabilities of the Designer(s)

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Another old "stupid" argument against Intelligent Design is that we cannot determine design unless we know the capabilities of the designer(s)- as in how do we know any agenc could design something like that?

Well how do we know stone-age people had the capability of designing and building Stonehenge? Stonehenge

How do we know bronze-age people had the capability to design and build the Antikythera mechansim? The Antikythera mechanism.

Point being if the mechanism did not exist- say we hadn't found it yet- if someone said the ancients had such a device no one would believe him/ her.

Ya see, as I have said before, designing agencies, successful designing agencies anyway, usually do have the capabilities to design what it is they are designing. Duh.