More info here:

http://www.40percent.club/2017/09/6lit.html

BOM (per side)

6 1n4148 diodes
6 MX compatible PCB mount switches
1 TRRS Jack Sparkfun PRT-12639
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

How to order PCBs from gerber files

EasyEDA ordering info:

PCB

Gerber: 6lit.zip

64.3mm Max* 91.7mm Max;
Layers: 2;
PCB Thickness: 1.6mm;
PCB Qty.: 10;
PCB Color: Green;
Surface Finish: HASL;
Copper Weight: 1;
Panelized PCBs: 1

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