More info here:

http://www.40percent.club/2018/05/gnapkin.html

BOM (per side)

36 1n4148 diodes
36 MX compatible PCB mount switches
1 Pro Micro 5v
2 12pin headers or 1 24pin machined pin wide socket
1 5.2mm SMT switch (RESET) https://lcsc.com/product-detail/Tactile-Switches_5-2mm-5-2mm_C92584.html

Needed if you want LEDs

36  LEDs
36  Resistors for LEDs. Use online LED caculator to choose value
1   FDS6630A or DMN3018SSS-13 SOIC FET
1   100ohm resistor
1   100Kilo ohm resistor

How to order PCBs from gerber files

EasyEDA ordering info:

Gnapkin

Gerber: gnapkin.zip

Layers:2 
Dimension: 55mm*238mm 
PCB Qty:10 
PCB Thickness:1.6 
PCB Color:Green 
Surface Finish:HASL(with lead) 
Copper Weight:1

Files released under https://creativecommons.org/licenses/by-nc-sa/4.0/