We’ve previously seen some of [Renzo]’s previous efforts in homemade PCB fabrication, up to and including applying green soldermask with the help of Fritzing. This is good, very good ...

Of course, like most homemade PCBs, there are no plated-through holes or solder mask or plating. Of course, you could add all of those things using additional steps. We’ve seen people use wires ...