Yo Pete, When you say "prototype", do you mean breadboarding and plugging stuff into the headers? If so, the next step would be to make a PCB, which is exactly

Yo Pete, When you say "prototype", do you mean breadboarding and plugging stuff into the headers? If so, the next step would be to make a PCB, which is exactly what this course is about. It would be "custom" but it's built on top of the Arduino. Plus it's all Open Source Hardware, which means the design files are open no matter what.