Approximating Body Position/Rotation (SteamVR)

Hi everyone!

Thanks in advance for any insight. I was wondering if anyone had a good solution for approximating body position using only the tracked headset and two Vive wands - eg: assuming we create a cube representing a users upper body/chest, is there a algorithm for approximating which direction the body is facing.

I could link the body cube to the tracked headset, but then it will incorrectly rotate when the user only rotates their head/neck (and not their body). My thought was to...

Approximating Body Position/Rotation (SteamVR)