Step 1:
This large paper is made of four green a4-size papers taped to four orange colored papers. Mountain-fold over the yellow line.

Step 6:
Fold the edges to the centerline.
Then unfold the folds of steps 4 to 6

Step 5:
Fold the edges to the centerline.

Step 2:
This is the other side of the paper.
Mountain-fold over the yellow line.

Step 4:
This is the green side of the model.
First prefold in half, then fold the edges to the centerline.

Step 3:
Fold over these two lines, all three parts are the same size.
Then unfold the folds of step 2 and 3

Step 10:
Tape or glue the edges together, see green area.
Then tape/glue the end on the left to the end on the right.

Step 8:
Mountain-fold over the two prefolded lines and valley-fold over the two outer lines.
Do the same on the seven other same places, see arrows.

Step 9:
Turn the model

Step 7:
Mountain-fold all prefolded lines into one direction.

Step 16:
Fold the edge inwards on about 8 spots

Step 15:
Press the stem into the orange part. Wrap the top of the orange part around the stem with your other hand.

Step 12:
Hold the green part in one hand and press the model outwards with your other hand. Do this by folding over the two yellow lines, they go all around the model.

Step 11:
Press the green part inwards.

Step 14:
Wrap tape around the green part

Step 13:
Here a part of step 12 is already done....

Step 17:
This is a bottom view, the edge is folded inwards on three spots now.
A small opening is left in the bottom. When the model is damaged you can press it into the right shape from the inside.