Rube Goldberg Machine | CC Unity Exe.1

It is a 3D Unity exercise in Creative Coding Course, only using physics to create a Rube Goldberg Machine.  

I tried to emulate some parts of an actual Rube Gold Machine that my students and I made together in a STEAM afternoon class at PS 118. I would like to add some bouncy effect on the balls colliding with each other and smashing objects.  In this exercise, I did not experience with a hinge which I really wanted to apply but the next project.