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Algernoq comments on In order to greatly reduce X-risk, design self-replicating spacecraft without AGI - Less Wrong Discussion
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I'd like to see a full conceptual design, especially for the software side. Each part seems doable with modern tools but the cost, development time and growth rate of this lunar factory needs a more detailed design study by people with industry experience. Fun to read but a bit hand-wave-y on the technical details.
There's a much longer report here:
http://www.islandone.org/MMSG/aasm/
It's one part of the results of a NASA workshop on the concept. Another related part not included in this web reference is section 4, which involved melting down and re-using space hardware -- especially shuttle external tanks -- in an orbital manufacturing complex.
These are high-level engineering studies, basically back of the envelope calculations that prove the concept feasible. The growth rate calculations are probably fairly accurate, but cost & development times require a project plan which this is not. if you have a few million dollars you could get it costed out though.