I have to make a roller coaster for a golf ball. It has to be made out of recycled materials. This also means no materials for construction (but chicken wire is allowed) and no prefabricated materials (Legos, Kenex, etc) 2 loops, 2 hills. Each hill has to be 20 cm height change. Can anyone give me suggestions on materials and what is the best way to build this type of contraption. I really do not have many tools and am trying to do this mostly with cardboard, but it isn't working out very well.