I think my garage pad and small wall was about 3-4 tonnes of carbon(approx 700 sq ft) . Knowing that, I'd imagine a house as they showed(fairly small) to be maybe 4-6 times that. So you may well be correct that it is less, though at our current McMansion equivalent sizes, it could get close.
I assume, thoguh, that they still need to be framed and insulated inside? Maybe not in Mexico, but I'm not sure it would be warm enough here. Or would they?
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