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DIY YouTuber builds cheap VR headset and makes it open-source
(www.notebookcheck.net)
This is a most excellent place for technology news and articles.
The lack of controllers is the biggest impediment to these "Homemade VR" projects.
You might as well slap your phone in a Cardboard VR and use ALVR, and you'll be surprised at how convincing it is, but you'll quickly find there aren't many VR games worth playing with the standard gamepad.
Basic headset would be good for sim racing.