Nice pics man. Though I hate to point it out but in the badass Gerwalk pic part of the neck has dislodged. And the Battroid knees can be slide in.
3: According to Actar's observation, it does matter whether the piece is L or R. I havent used my piece so I cant be sure. Check Actar's video.
My rear landinbg gear sits at a bit of an angle too. I think its meant to be like that. It does lock in place anyhow.