Good book! This book has been around for years, although he hasn't updated his materials costs to reflect inflation or [the price of oil]. $50 won't buy the polyethylene sheet any more. I would add some building science to the concept and add some extruded polystyrene insulation to the system, especially in Alaska. Ground temperature may be warmer than ambient air temperature most of the winter, but that doesn't mean you can do well in 30-40 degree indoor temps when the ground freezes 5 or 6' down. Just remember, no matter what the temperature in the room is, it's always room temperature. Add some PV, which works in summer up there, and you are in business.
Alaska has No Building Codes except in cities large enough to have their own. The banks have a "5 Star Home" scientifically correct energy efficient building loan with a 1/2% interest rate advantage and their own inspection system. The building community voluntarily builds great houses that don't self-destruct or sicken their occupants. It's a small community and word gets around.
...
A friend of mine who reps heat recovery ventilators (HRV) just went to Alaska to check things out and thought he had stepped into an alternate universe.