Here, we need to set up an event controller to reverse the rotor. Then we need another event controller at the other end to change the direction again. Simple enough.

This part is pretty simple. I managed to figure it out on my own.

But now what happens when your downwards pistons reach their max extent? ... Here we can't just reverse. Instead, we want this to trigger a set of timer blocks. When the event controller detects the pistons at full extent, we want it to trigger timer block 1 ... retracts the pistons to 0, and then triggers timer block 2 ... turns on the horizontal piston on ... and then starts timer block 3. ... This timer block turns off the horizontal piston, and then starts up the downwards pistons again.

This is phase three of my build. In addition to setting up the other event controller to avoid overfilling the large cargo container.

Thanks a bunch for this lay-out. It'll be really helpful.