Step 1:
These are four standard size papers taped into one large paper. Tin foil is taped to one side of it.
Prefold in half over these two lines.

Step 6:
Prefold the edges to the centerline.

Step 5:
Mountain-fold over the upper layer only.

Step 2:
Mountain-fold the edges a little bit next of the centerline.
Turn the model.

Step 4:
Prefold in the center of the prefolded lines.
Turn the model.

Step 3:
Prefold in three parts of the same size.
Turn the model again.

Step 10:
Repeat step 8 over these lines.

Step 8:
Pull the part on the right of the black lines to the left.
Use tape or glue to connect the edges.

Step 9:
Repeat step 8 over these lines.

Step 7:
Mountain-fold over this line.

Step 16:
Make the same kind of folds as in step 12 over these lines.

Step 15:
Close the model by repeating the folds of step 12.

Step 12:
Make the same kind of folds as in step 8 over these lines. The lines on the right are already prefolded.

Step 11:
Repeat step 8 one more time, without taping/glueing the edges.

Step 14:
Valley-fold the edge to the prefolded line.

Step 13:
Prefold over this line, use the width of the lid as guidance, see arrow.
The model will open a little by making this fold, see next picture.

Step 17:
Tape or glue these edges together, do the same on the other side.