Step 2: The Throwing Arm.
We'll do the hardest single piece first.
The throwing arm has two ends (doh!), which both need folding properly to make it work.
1. Cut out the arm (cut all solid lines, score all dotted lines), and use the cocktail stick to pierce holes at the dots.
2. Fold the whole thing into a square-section beam. Glue the full length of the flap and allow to dry. You will be able to tell which way up the beam goes by looking at the writing down the sides.
3. At the "flippy end", fold the two narrow flaps over and glue their outsides. Fold the long central flap over the narrow flaps and pinch gently along the corners to make it stick. Glue under the end of the long flap to stick to the underside of the arm.
4. At the bucket end of the arm, there is a flap connected to the top surface of the beam. Glue under the end of the flap, and press it down into the beam - it should stick to the inside of the lower face of the beam, and block off the end of the beam at the same time, preventing ammunition slipping down inside the arm, which would be inconvenient.
5. Glue the outside face of the two side flaps and fold them over to make the back / end of the bucket. You should have one flap left - lift it up and stick to the outer side of the two flaps you just glued.
The arm is done. Set it aside for now.