Algodoo

Very clever! Only one problem.... The car chasses occasionally get jammed as they drop down onto the conveyer (They get stuck when they pitch up against the overhead slope. A good way to fix that would be some sort of latch on each side of the column of chasses that holds the bottom chassis until needed, and then it releases the bottom one while latching the next one above it. That scheme will allow just one chassis at a time to drop onto the conveyor. That can easily be done with four little mechanical latches controlled via Thyme script. But maybe you can figure a simpler way to dot it?

Overall, nice job!