How Do You Make a Raspberry Pi from Scratch?

Hey guys,

I've recently taken a interest in raspberry pi, probably a month ago, and I am sort of an expert in Arduino, since I've made things like almost totally AI and sorts, so I wanted to build a Raspberry Pi from scratch on a PCB or a breadboard, cause I am really getting angry waiting for pi's to be delivered. So anything you can help me with is appreciated. Thanks!