They are divided by color and material. You will need to cut almost all the shapes again using plywood or other wooden material of your choice and glue them in layers to make the full thickness of the pieces. Make it at least 5 mm thicker than half the diameter of your ball.
Open Easel file to see all the pieces needed on the top of the ramps.
My boards ended up with 70 × 53 cm and the overall size of the machine is 140 × 55 × 20 (middle) cm .
I cut the middle angle on the boards’ edges to 8º. It seemed to be a good inclination for the balls to roll but you might use a slightly different angle. The steel balls I used are 22mm in diameter.