Step 5: Place a round, white chocolate sweet in the centre of each wheel. Stick a few brown wafer biscuits with chocolate icing to each other. Build a roof with the snack sticks and the brown wafer biscuits. Use Smarties for lights and cream-coloured wafer biscuits and liquorices for the windscreen and grill. Use a piece of liquorices for an upright exhaust pipe. Use instant glue and stick cotton wool to the wire. Bend the wire to appear like smoke coming from the exhaust pipe and stick the bottom into the liquorices. Place a driver on the tractor and wagons. [Photo/icpress]