Construction crew: Derek (job supervisor), Jared and Haley (skilled craftworkers)
Materials: Snow, lots of it. Sleds for hauling snow. Hands for placing snow.
The interior: note the side light and the abundant floor and headspace.
What a neat project! It took Derek and his kids about 5 hours to build this, and when completed it stood well over 6 feet tall. When we saw it today, it had been melted and "condensed" by the rain, but was still sturdy and big.