Thanks. The roller coaster is going to take me some time to complete, as I want to make it as cool as possible... and I am not sure what people consider "cool". Meanwhile I have a new interactive shop ready: Race Track   This module has 65 gears and 3 motors for the functions where it allows guests to boost their favourite horse to the finish line (detected using the color sensor). I am using the following setup with standard corner modules when testing a new module like this:     The horses are pushed using crossing minifigures that push the "pushers", somewhat reflecting how the real game works.   I had to place the hub above the base this time due to the large amount of mechanical components in the base. The door can be opened to start and stop the hub, and the whole section can be removed for servicing (such as attaching the power cable)     There is a full video with me explaining all the details here: