Simple box for switches, with connectors for common peripherals and some room for power supply for LED stripes.

IEC C14 for power input
IEC C13 power outlet for printer
“Standard” AC outlet for supply for Raspberry Pi 
Round DC connector 5.5/2.1mm
 

Hardware:

• 3 switches for 30.4x11.2mm mount hole (i.e. https://www.tme.eu/pl/en/details/rs1391bbr2n2/rocker-switches/sci/r13-91b-01-br-2d-n-2/)
• combined IEC C13/C14 socket with switch for 34.4x106mm mount hole (https://www.tme.eu/pl/en/details/bzh11_z0000_11/iec-60320-connectors/bulgin/) - remember to buy 5x20mm fuse, too
• AC socket - cheap "Lexman" one, with 50x50mm face and 60x60mm mounting holes and 8mm depth
• DC socket (i.e. 5.5/2.1 ) for LED stripes
• power supply for LED stripes
• bunch of 6.3x0.8mm connectors, wires, screw type/wago quick connectors, etc.