The pyramids were built roughly 4,500 years ago. With possibly some sort of copper tools, copper drills, and sand/quartz as an abrasive. Built to a degree of accuracy that modern houses lack.
With that in perspective, metal work is relatively easy, provided you can gather enough metal. Just heat, bang, heat, bang, etc.
We could re-make armor today relatively easily. No one is tackling re-building a pyramid because it would cost in excess of a billion dollars, even with modern tools.
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