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I wanted to make something like this myself, it's been on my mind for a while now. I have been thinking of using laser-engraved aluminum panels instead of granite, and mount them on a cave somewhere. Anyone have any idea of how long the aluminum can last? Is it at least 1000 years?

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You might be interested in looking at http://rosettaproject.org/ or talking to some of the people who worked on that. I assume they did a lot of research on materials and engraving processes (although they finished their prototypes a decade ago, so it might not be as state-of-the-art as it could be).

> Anyone have any idea of how long the aluminum can last? Is it at least 1000 years?

Probably depends on how deeply you engrave them.

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