No, we were doing full body tracking with perception neuron inertial sensors tracking 7 years ago in AltspaceVR. My guess is the zero cost option is going to be using a home mirror, as recently demoed. It can also be done with outside in cameras, was done with Kinect literally almost a decade ago or with lighthouse pucks from valve 4-5 years ago. Facial and eye tracking will almost certainly be in the next meta headset.

Motion sickness goes down with each generation and is also largely a function of software design anyway. You’re very behind the curve.