If you want to get the PCB made you need to download the ZIP and upload it to the website of the manufacture I can recommend JLCPCB, Seeed Fusion or PCBway. If you want the silkscreen in yellow AllPCB is a pretty affordable choice.
- download the ZIP file
- upload the ZIP file to the website of the manufacturer.
- sometimes the Gerber preview from JLCPCB can't display the PCB, even when the files are fine. In this case use these dimensions: 258.7mm * 94.35mm
- PCB Thickness 1.6mm
- 2 layers
- PCB Qty as much as you like. One PCB is a full keyboard.
- PCB Color Black (or any other color you like)
- No impedance control
- Surface Finish HASL(with lead) if you want the easiest soldering experience or LeadFree HASL.
- Remove Order Number Yes
If you only want to check the traces or see what is connected to which pin you can take a look at these graphics. You can also take a look at the schematics and the PCB as PDF.
You can download the project if you need to take a deeper look or modify something. You need the Open Source software KiCad to open it.