Four Birch poles were lashed together and set up as a quadro-pod and then other poles were laid between.
After a simple doorway was constructed we gathered Spruce boughs and began inserting them between the poles.
We put the boughs on the opposite way up to which they had grown, with the end of the bough that was nearest to the tree, pointing upwards.
The top of the structure was left open to allow smoke from the fire to get out.
Here’s a picture taken inside with a fire.
and it was still in good condition when we returned the following winter.