Build a model of the canoe as shown above. The Rhino file linked below includes some useful geometry for building this object.
http://cad2017.christopherspecce.com/wp-content/uploads/2017/10/CanoeExercise.zip
Here are the Grasshopper definitions I showed last week, with several variations on how to draw a star.
http://cad2017.christopherspecce.com/wp-content/uploads/2017/10/StarBuilder.zip