Q: How do you get past the problem of it not being possible to use screws in glass?
(I am assuming that the glass must be tempered to withstand airball impacts)
I imagine you'd need a LOT of precision (cnc) bolt holes?
Also, if you over tighten B & N and break the surface tension of the glass - kablooey!
Forget to incorporate one hole in the layout and you'd be rooted too

Yeh, there's all that too, but he did say top use the glass laid on top of the (wooden) playfield, which would still use  the screws -  see my response above, regarding playfield-wood/thickness/screws etc....

MM