Make your own LED Bar - Part 2 (better light diffusion, backplate construction)

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15x10 RGB LED Matrix Demo: http://youtu.be/vjLGA3q26og
Part 1: http://youtu.be/_NEK5YwKGKk
4x4x4 RGB LED Cube: http://youtu.be/EnM3p2TmWXc
More project info on Instructables (parts list, schematic, arduino code): http://www.instructables.com/id/Make-your-own-LED-Bar/

Parts list (affiliate links):
Aliexpress:
WS2812B LED Strip: https://s.click.aliexpress.com/e/_d7UgTnE
Hook up wire: https://s.click.aliexpress.com/e/_dSjlxDI
1x 5V 3A Power Supply: https://s.click.aliexpress.com/e/_dXaot6s
1x Attiny85: https://s.click.aliexpress.com/e/_d6jWL8U
1x 8 Pin IC Socket: https://s.click.aliexpress.com/e/_dUOyoO4
1x 10k Resistor: https://s.click.aliexpress.com/e/_dTPpXjt
2x 2 Pin Terminal: https://s.click.aliexpress.com/e/_dYbstfZ
1x Tactile Push Button: https://s.click.aliexpress.com/e/_dXIIMcP
1x 10k Potentiometer: https://s.click.aliexpress.com/e/_dX83GAF
1x PCB (copper lines): https://s.click.aliexpress.com/e/_dY2kgvt
1x Power Switch: https://s.click.aliexpress.com/e/_d9dxPD5

In the second part of the LED Bar I will talk about how I made the light diffusion for the top shelf even better. But the main focus of this part will be the construction of a backplate for the bar, so that no light of the LED matrix can escape through the back.

Music:
In the Hall of the Mountain King, Kevin MacLeod (incompetech.com)