i not rig expert but I believe you'll need an aim constraint on the elbow. Also try tweaking its position slightly to influence which way it wants to bend. Like oglu said, for human characters there is so many powerful and free auto-rigs out there, no reason to do yourself unless you just triyng to learn (in which case,…
I tried the rotation order on the segment joints, the result joints, and everything else attach to this part of the rig including the constrains with no effect. Aim constraint works but doesn't, it appears to fix it however the segment joints and their bind joints no longer stay with result joints and adding a point…