Raspberry Pi 1B DIN Mount controller

I made this because I needed to replace a faulty PLC controller og wanted to build my own.
My old Raspberry Pi model 1B was not being used anymore, so I figured it would be suitable for this task.
I purchased the output board from Bangood, a cheap 8 channel solid state relay board that can control 230VAC/2A and only need 3.3V DC to trigger.
The input board is self made, from an empty soldering board, 8 low voltage LED's, 300Ohm resistors and some terminals.
Everything is connected to the GPIO header on the Pi, and the IO's are also powered from the GPIO.
The control application is made with the Hollywood programming language, which use a few python scripts to communicate with the GPIO's.

As might see from the pictures, all parts are printed in same colour, exept for the DIN-lock. This is because that part was reused from som other scrapped equipment. I did still make a STL file for it, to make this complete.
Also that metal spring for the lock is obviously not 3D printed. Here