Here are some internal pictures of the Asus C302 chromebook.
You will need to remove the back feet to be able to open it. The feets are glued and there is a screw under each foot.
Asus C302 is a 64 Gb disk, 4Gb of ram, Intel core m3 model.
Goto https://github.com/lafa/vpn_enforce and follow the instructions. This assumes you already configured your vpn on gnome network settings...