Parts 

-  4 x 5V 10A Power supply  (one for each Matrix panel)  e.g. MeanWelll, RS-50-5

-  4 x 8x32 RGB WS2812b matrix panel e.g https://www.adafruit.com/product/2294

-  1 x Raspberry Pi 3

-  36 x  spant- holder from poplar plywood (4 mm) Part 1 (see Gallery)

-  12 x poplar plywood (4 mm)  Part 2; Laser cutting size 300 x 200 mm

-  12 x poplar plywood (4 mm)  Part 3; Laser cutting size 300 x 200 mm

-  some single wires 1 mm*mm