Very cool project! I had a couple ideas during the read:
* A ceiling-based pully system could help take the physical load off the users and may allow for increased sensor density. Some large/public VR setups do this.
* I'm sure you considered it, but a double-converting UPS might reduce the noise floor of your sensors and could potentially support multiple booths. Expensive though, and it's already mentioned that data quantity > quality at this stage. Maybe a future fine-tuning step could leverage this.
Cool write up and hope to see more in the future!
We actually did try making a pulley-system to reduce weight at one point. The issue was that it moved the headset kind of oddly WRT the person's head, which reduced sensor contact. One thing we intend to try is pulley system + good chinstrap, which might make the headset stay still and let us reduce the weight at the same time. Good ideas!