Arduplane bixlar errors on page

I was looking at the first time set up and went down to bixler plane set up page and there they show 4 different power sources connected and it makes no sense. 1 3dr power module , 2 esc ,3 bec , 4 ubec , all at the same time. none connected to a motor. could someone please tell me the correct way to hook this thing up. I have a eagle model (bird look alike of a bald eagle ) that I want to connect a apm 2.6 to , with a camera , osd , and 3dr telemetry.
I`m finding a lot of I think errors ,or at least very confussing things on apm website.

thank you world for any help you could provide , going crazy trying to get help with this

Gordon Bennett