Step 1:
Use a large square paper, prefold in half over both lines.

Step 6:
Fold over the prefolded lines, then turn the model.

Step 5:
Use the prefolded lines as guidance.

Step 2:
Fold both halfs in three parts of the same size.

Step 4:
Repeat step 2 and 3 in the other direction.

Step 3:
Fold the edges to the centerline, then unfold the model.

Step 10:
Fold the edge upwards.

Step 8:
Fold over the prefolded lines, then press the edge to the left.

Step 9:
Make these folding lines sharper

Step 7:
Press the edge downwards.

Step 16:
Fold the edge on the left upwards.

Step 15:
Fold the purple parts in half

Step 12:
Glue these parts together.

Step 11:
Fold these two edges upwards.

Step 14:
Fold / press these three flaps downwards

Step 13:
Fold this edge upwards.

Step 18:
Fold the purple parts in half.

Step 17:
Fold / press the two flaps downwards

Step 19:
Fold the left door backwards a little.