Step 1:
I glued four small papers together into one large Origami paper.
Prefold in half over both lines

Step 6:
Repeat steps 2 to 5 in this direction.

Step 5:
Fold to the centerline one more time, then unfold the model.

Step 2:
Fold the edges to the centerline

Step 4:
Fold the edges to the centerline

Step 3:
Fold the edges to the centerline.

Step 10:
Press flat, see arrows.

Step 8:
Make sharper folding lines. The 2 valley-folds are one square off the centerline. There are six prefolded squares between the outer lines.

Step 9:
The yellow rectangle will be the steering hut. Use the prefolded lines as guidance.

Step 7:
Make sharper folding lines, the line on the right is the centerline of the paper. There are eight prefolded squares between the outer lines.

Step 16:
Repeat step 9 and 10 two more times.

Step 15:
Repeat step 9 and 10 over these lines.

Step 12:
Repeat steps 9 and 10 two more times.

Step 11:
The yellow line indicates the steering hut.
Repeat steps 9 and 10 over these lines

Step 14:
The yellow line indicates the upper deck.
Repeat step 9 and 10 over these lines.

Step 13:
Make sharper folding lines around the steering hut.

Step 21:
Fold over these two lines.

Step 19:
Make the same fold on the other side.

Step 20:
Fold both corners downwards and glue or tape the edges together.

Step 18:
Fold the left edge downwards, it's two squares wide

Step 17:
All four lines are already prefolded

Step 22:
Fold the edge downwards, it's three squares wide.

Step 24:
Fold the corner inwards, do the same on the other side.

Step 23:
Fold both flaps towards each other, use glue or tape