[/quote]
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
[/quote]

Aha!  . . . I didn't read Swinks' article properly (sorry).
It still strikes me as a huge undertaking, but if you have any success that would be terrific.

I recently worked on a GnR playfield which had been cleared with two-pack CERAMIC. The finish looked like a sheet of glass and should very durable.

Let us know if you make any headway.

PP