I really like this build but dont get how you've modified the battery compartment to fit this.

So it turns out that the google translate app has more functions than the website including the ability to use the camera. It works well enough most the time but doesnt seem to have done much good here

Is there an english version of that PDF? The design of the GB+Pi seems good and theyve gone all out in terms of photography its stunning, I think theres likely alot of notices we are missing from that PDF.