I am using due with my project and I need to make a pcb including my circuit and the arduino due circuit on the same pcb. Some of the features that i need are ethernet, sdcard, usb, spi and a bunch of other lines.
What is the best way to go about it. Should I start with the datasheets of the chips and start from scratch or take the due and ethernet shield schematics, merge them somehow and then remove the unnecessary parts. What are some of the obvious candidates for removal. Any dos or donts for this approach? This is my first time doing this kind of a thing, so any help is appreciated.