Build with strong pieces, and arrange them so they cannot collapse on you.
Here’s the finished frame. Note that it is free standing. The supports for the beam are a pair of forked sticks that link together to hold up the beam.
Cover the frame with leaves, ferns, pine straw, grass or whatever you have to act as insulation.
Start at the bottom, and work your way up. You’ll need a lot of leaves. Use a foot-and-a-half-thick layer in warm weather and two to three feet in cold weather.
Our finished home away from home.

This hut is a simple design that works well enough, if you put enough leaves or other vegetation on top of it for weather resistance, and enough material inside the hut for warmth.