Nice job, but…
Handling Rockwool without gloves
Not sealing the timber (which looks like basic Douglas Fir or Larch, so needs it)
Concrete “castle” foundations only (watch me sink into the ground, baby)
Windows only glued in
No way that stove will heat the cabin sufficiently in winter
No protection for the underfloor insulation except chicken wire
There’s probably a few more things too.
