I can try, but I'd need someone with experience to review it, as I never did a rig from scrath - I mostly used Blender's rigfy add-on, but it doesn't works ingame and only for bipeds... I am not an animator. But that doesn't stops me to learn it. Anyways, I've started to research the ox anatomy. I'll dump what I find interesting here. If someone comes up with something better, please post it here too.