I'm always intrigued by the Segal method, but it's so closely tied to the sizes of construction materials available at the time and I can't help wondering if anything has changed since.
I've been thinking about doing this, and my main thought is that the insulation standards were probably effectively non-existent at the time, beyond "as few draughts as possible"!
Edit: not sure if these will be geo-blocked, but there are a couple of programmes about that project here:
Oh, absolutely. It's just that I've seen some of the original buildings in south east London and they looked absolutely freezing - single glazing with metal-framed windows. The walls looked like thin painted plywood, but I don't think that can be the case. It looks like they've updated them now: https://programme.openhouse.org.uk/listings/1615