>>393911351
They are good for regular listening.
You not only can buy similar drivers, nowadays you can even buy the exact driver.
https://www.parts-express.com/Tectonic-TEBM35C02-6B-1-3-4-BMR-Full-Range-Headphone-Driver-6-Ohms-297-2174
The only thing to note is that you need to apply DSP to it to get it to sound the same. Most likely you can get it sounding pretty close by just EQing the bass up and using a dedicated amp to power it. 

>>393911650
If one is making this I suggest against this type of head mount. It turns out that those arms that stick out towards the sides to grip your head are physically noticeable enough to make you feel a little less like "wow it's like I'm not wearing headphones". My suggestion would be to instead get a PSVR/Rift S halo strap and mount the speakers on those via 3D printing.