More info here:

http://www.40percent.club/2018/04/gnap-4x4.html

BOM

1   Arduino Micro (not a Pro Micro)
47  1n4148 diodes
47  MX compatible PCB mount switches
1   2U PCB mount stabilizer

How to order PCBs from gerber files

EasyEDA ordering info:

GNAP 4x4 Left

Gerber: GNAP4x4L.zip

85.7mm Max* 76.2mm Max;
Layers: 2;
PCB Thickness: 1.6mm;
PCB Qty.: 10;
PCB Color: Green;
Surface Finish: HASL;
Copper Weight: 1;
Panelized PCBs: 1

GNAP 4x4 Middle

Gerber: GNAP4x4M.zip

85.7mm Max* 76.2mm Max;
Layers: 2;
PCB Thickness: 1.6mm;
PCB Qty.: 10;
PCB Color: Green;
Surface Finish: HASL;
Copper Weight: 1;
Panelized PCBs: 1

GNAP 4x4 Right

Gerber: GNAP4x4R.zip

85.7mm Max* 76.2mm 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/