Step 1:
This is the frontside of the paper, turn the paper.

Step 6:
Fold over these 2 lines.

Step 5:
Squash-fold the flap.

Step 2:
Prefold in half four times.

Step 4:
Fold this flap straight upwards.

Step 3:
Fold over the 2 lines at the bottom right, then over the 2 diagonal lines. And then over the 2 lines at the top left.

Step 10:
Fold the triangle flap upwards.

Step 8:
Fold this edge downwards.

Step 9:
Press / fold these edges downwards.

Step 7:
Unfold both folds.

Step 16:
Fold the flap sidewards.

Step 15:
Bookfold this edge to the left.

Step 12:
Fold the triangle flap to the inside of the model.

Step 11:
Pull open.

Step 14:
Repeat steps 5 to 13 on the other three large flaps.

Step 13:
Close the model again.

Step 21:
Repeat step 19 and 20 on the other edge. 

Step 19:
Mountain-fold over this line.

Step 20:
Press flat.

Step 18:
Open the model, see arrow.

Step 17:
Mountain-fold over the left line and valley-fold over the right line. Make the same folds on the backside.

Step 22:
Repeat steps 16 to 21 on the left (mirrorwise).

Step 28:
Squash-fold the tip (make the same folds as the 2 short lines on the backside).

Step 25:
Close the flap again.

Step 26:
Repeat step 24 on the left.

Step 24:
Fold over these two lines.

Step 23:
Open this flap and turn the model.

Step 29:
Mountain-fold over this line.

Step 27:
Turn the model again.

Step 30:
Mountain-fold over this line, make the same fold on the other side.

Step 31:
Repeat steps 28 to 30 on the left.

Step 32:
Press both legs flat from aside, see arrows as example.

Step 33:
Mountain-fold over the left line and valley-fold over the right line. Make the same folds on the backside.

Step 35:
Mountain-fold over this line.

Step 34:
Valley-fold over this line.

Step 36:
Valley-fold over this line.

Step 37:
Repeat steps 33 to 36 on the left.

Step 38:
Press both arms flat from aside.

Step 39:
Fold over these two lines.

Step 41:
Mountain-fold over this line.

Step 40:
Mountain-fold over these two lines, press the model flat afterwards.

Step 42:
Press the upper edge downwards over this line.