Bill Mollison on Housing

Once again, I was surfing YouTube and came across a video I think would be nice to share with to share with others; this is Bill Mollison talking about housing:

It says it is part one, but I have not found a part 2 to follow it.

Interesting,
I got confused about the construction of his 'northern' walls. But as Bill Mollison is from australia, which is southern hemisphere, I probably have to mirror this to south, as I'm in the northern hemisphere.
Are we looking at a part of a lecture for a PDC here?

It could be from a PDC; I do not know. Yes, in the Northern Hemisphere, I think the walls would be flipped.