There’s an interesting tutorial on instructables by BrendanC1 about using desktop streaming apps to stream from a desktop computer to a mobile phone.
His top pick is Kinoni Remote Desktop, which is free. This idea is pretty interesting since you can stream from your desktop to phone over WiFi.
The instructables article showed the author printing his own 3D headset. A true maker.
The upload VR article suggested Fiit VR, which I now see online for $16. it’s a flash sale which ends in 4 days.