Hi Piotr, I'm a Chinese and studied in Vancouver and I'm also a RED owner, after school I went back China this year June, I taking my EPIC back with airline, I kept the body , lenses, etc with me and checked in everything else, for sure the body is overweight, but once I told them it's a camera and no way I can check in this, they just let me go.
For the customs, I don't know the specific policy but after I landed, the customs didn't charge me anything just ask me to filled a form and i'm free to go, it may different if you are not a Chinese, but I don't think they will charge you money as long as you said it's for yourself.
