Slightly off topic, however relative to using Eagle to design a PCB. I’ve built a gas powered bicycle. It uses a Chinese 2-stroke engine purchased off the internet for approximately $125. The kit includes everything needed to convert a basic bicycle into a motorized version. Here is my Beach Cruiser:
I’ve made a few improvements to the package over time, the most recent being a high-power CDI/coil electronic ignition system. Cost of the CDI/coil package is about $20 each. This was the first time I used a potting compound to seal the board from the elements. The PCBs were made at OSHPark.com in a batch of 3 for approximately $14. Anyone interested in the files and list of materials can email me.