upside down, the railings to the front, on the third row from the
front, on the 5th-9th columns from the left (not counting the
receiver).
Put another such piece hor to the back, symm.
Number 12.
Flip right side up. Affix two stickers with the number 14 on them
to the front and to the back, in the middle level, at the right
end.
Install as is to the left end of your structure, on the two
leftmost columns and overhanging to the left. The insert picture
shows the finger pressing on the seat.
Bag 20.
Put a 3x1 hor on the right end of the front wall.
Skip two columns to the left and put a 4x1 hor there.
Put a F 6x1 hor to the left.
Repeat.
Repeat steps 1-4 symm at the back.
Bag 21.
Put a F 4x2 ver in the middle of the right edge and to the right.
Put a FS 4x1 ver on top, on the right column.
Skip ten columns from the right edge and put a F 4x1 hor on the
front wall.
Repeat symm at the back.
Put a F 6x1 hor to the left.
Repeat symm at the front.
Put a F 1x1 to the left.
Repeat symm at the back.
Put a F 6x1 ver to the left of the two PPs.
Bag 22.
Put a F 4x1 ver on top of the PP, in the middle.
Put a FS 6x1 hor to the front and to the right.
Put a FS 6x1 hor to the right.