Prototype:
PCB dimensions: 45 x 90 x 1.6 mm
Diffusor dimensions: 54 x 90 x 3 mm
8 rows by 4 columns of WS2812B LEDs = 32 LEDs per PCB
6 PCBs * 32 LEDs = 192 LEDs total
192 * 15 mA (worst case current consumption at 3.7 V supply voltage) = 2.88 A total current