Those are all valid concerns, but (and I don't mean this negatively), they seem to be more "first world" problems. For the majority of the people on this planet

Those are all valid concerns, but (and I don't mean this negatively), they seem to be more "first world" problems. For the majority of the people on this planet (c.f., Haiti), a sturdy box with a roof itself will be a huge step up. Imagine an army of robots just toiling away, building a structure per day. The locals provide sand, and a barrel of ink, and out comes a house. Their very own house, sturdy enough to survive a hurricane or flooding. Yes, this isn't perfect, but nothing is at first. Things approach perfection after several iterations.