Dear Dale,
Excuse me for not coming back earlier to watch the progress of the building.
I just have read all the five pages and 71 posts of this thread!!
It was quite difficult to follow because of the technical language of construction. At the same time it was nicely instructive and exciting as a true story.
It's amazing the work you have done.

We can easily imagine how you will live in harmony with the house. Making a home is perhaps the oldest thing in the world but that no one does anymore, except you. 
I have been surprised all along by the techniques used in the building process and by some design principles that I have never seen applied at home.
As I believe to understand, the key word is this:
"We Can Get down to -40 here"
All these techniques are playing in the fight against the cold!

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"The ground source Geo-exchange system was a big project"
An incredible project I would say! Pipes under the ground:
"We put in 1800 lineal feet (548 m) which required us to dig trenches about 6'(1.8 m) deep x 10'(3 m)",
and how many lineal feet of pipes have you put inside the concrete floors..?
You had to strongly believe in this technique to invest such efforts and money ! May be I have to consider this at home?
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The insulated roof covered with galvanized sheet metal rather than tiles, I presume to withstand the snow and allow it to slip.
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by the end, the incredible nice construction of the fire place, built almost like a separate building. the chimney built outside the house (I don't know why: don't you lost some warm by this way ?). I only find strange you haven't installed an insert as heat recovery.
About the technique "to acid stain the floors" I've never seen this practiced at home. It sounds quite simple, beautiful and cheap.
What I also find human and beautiful with your story is that everything is underlain by the arrival of winter. It's a race against time.
"Winter strikes hard and fast here, and I am really pushing to not get caught."
Dear Dale and Judy, what you do is great and I wish you all the best in your house and the land surrounding it.
very friendly as you know,
simon.