Place the butter in a bowl, whisk in the sugar and salt using the whisk attachment on a mixer. Add the eggs one at a time and continue to whisk until the mixture becomes lighter in colour. Pour in the milk, mix together.
Combine the flour and baking powder, mix into the cake batter. Break the chocolate into pieces. Heat the milk in a small pan. Remove the pan from the heat, add the chocolate, melt. Stir the chocolate into the batter. Line the cake tin with baking paper. Transfer the cake batter to the tin.
Approx. 55 mins. in the lower half of an oven preheated to 180°C. Remove from the oven, allow to cool slightly, remove the cake from the tin and leave to cool on a rack.
Slice the top off the cake. Cut one end of the cake at an angle to create a point, create a captain's deck using the removed corner pieces. Place the boat on a rack, place a sheet of baking paper underneath. Melt the cake icing, pour over the cake so that the entire surface is covered in chocolate, allow to dry.
Using the edible glue, stick Smarties around the boat, stick the chocolate bars along the edge for railing and insert Mikado sticks into the sides for oars. Make three sails out of paper, insert into the cake with wooden skewers.