On his
Github Repo Emmanuel says : "If you are missing a part or information of the Electronics feel free to file an issue on github".
So I believe you should open an issue there with your questions.
I have to warn you that Emmanuel designs are evolving fast and he never stops : don't expect a stable version of the design, you'll have to print upgrades again and again - which might be a good thing after all ^_^
Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.
