I want to make shape trains with my kids this week, and for the life of me I can not remember how to do it! I keep trying to sketch out the shapes, and my trains just are not looking right. Can anyone remind me what shapes I need and where they are positioned? Such an easy project and yet it's giving me grief. I want each kid to make one individually to take home, not just a piece of a train to put together on the wall. Thanks!