Here is my latest creation. The Star Lines Mars Conveyor. It is a 3" BMS BT with a 38mm x 9" mmt. It's 45" long and weighs 46 ounces with a chute. The balls are 6" styrofoam. I used epoxy clay to fill the gaps between the balls. They were cored out with a hot knife for foam. There is a trough for the launch rail. The stars are adhesive backed paper that I colored with a sharpie. Here are some build pictures.