So if I'm reading this right, they're using the existing structure of the hemp fibres as a sort of scaffold, boiling off the non-carbon parts to leave, essentia

So if I'm reading this right, they're using the existing structure of the hemp fibres as a sort of scaffold, boiling off the non-carbon parts to leave, essentially, charcoal? Not bad. Might be worth investigating lawn clippings for the same kind of properties.