If you want to make this business car for yourself, first download all project files or clone github repository.

PCB is designed with KiCAD8. You will want to update PCB bottom silkscreen with information relevant for you.

It depends on you if you want to make additional changes.

Generate new gerber files. I used JLCPCB design rules for PCB, but there should be no issues with other manufacturers like PCBWay.

Components should be easy to find on usual suppliers, check BOM.csv file.

Start from smallest 0805 components and then ICs. Sockets, switches and so on should be soldered last.