Re: How is GURPS Alpha Centauri.
So, for writing...aside from the impossibility of absolutely proving that something didn't exist (as opposed to establishing good evidence), we've pretty well verified that pre-literate human societies can exist, because they still do.
A very low powered thing that could be styled a steam engine might be buildable out of stone-age materials (I imagine hanging a crude aeolipile-type jet assembly from a cord, since you couldn't really make a bearing. I am not a mechanical engineer). I'm not sure what you think you could do with one, though, if it worked at all...
Stonehenge demonstrates that the fairly-ancients had good memory and could recognize patterns. Not sure why you think that says anything much about technology.
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