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I am now posting a coupe of photos of my existing setup.

The Black box (!) on top of the printer enclosure hosts the Pi, a 4- relay module , a fan and a PSU.
Three illuminated switches on the front control printer power, printer lights and an enclosure fan extractor.
The box connects to the the printer enclosure with a cat5e cable (blue cable with aviation connector) which caries 12V,5V power, I2C lines for temperature monitoring.
A smoke detector is also connected to my house alarm system.

Adding a screen poses another challenge since some of the pins of the PIs expansion header are being used for switches relays etc.
I d have to figure out a way to connect both the screen as well as these pins.