Step 9 - Cable management
Now you can run all the cables through the machine.
I installed the ultrasonic sensor from above drilling two holes in the top plate and ran the cables from behind into the machine and down to the Arduino.
I fixated the cables with duct type here and there. There might be better ways to manage the cables though. After about 2 years now the duct tape starts to come loose. You might want to better apply other, cleaner cable management techniques.
It is now the time to lock the door of the machine.