All parts used are only parts that come from Aliexpress.com. The PCB's are from dirtypcbs.com where they get a identification number printed on them (in this case *45070*) this is also the name of the individual projects on http://gijs.gieskes.nl/dirtyexpress/. Combining these two company website names gives DirtyExpress (the project name). At dirtypcbs.com you get 10pcs of the same PCB, this is why they are designed in tile form factor, this way they can be used all together as one PCB. The whole circuit is a maze of parts where every part has a functionality but it is difficult to see what is going because of the intentional complexity of the circuit.