I like the idea of finished concrete floors, although I understand why some object. I love the look of the concrete acid stains and using it as a heat since to moderate temperature swings.
I would put more windows on the south side in the great room for more passive solar heating. It can save a fortune in heating bills for very little cost, especially since you are using all electric.
How can this be built with more insulation and features than conventional cconstruction, for less money
How did you solve the problem of moisture coming up from the ground into the concrete?
Did you provide expansion joints or control joints to control where the concrete will crack? I would cut control joints into a pattern on the floor and fill with grout to make the concrete look like stone or tile. Then, if/when the slab cracks you can regrout.