I found those files. Might give it a go 😀
I really wanted the original disc because of the CDDA tracks. I believe the Steam version of Quake doesn't include them.
Wanted to do some Voodoo benchmarking, but that project is now on the backburner. Might try your trick next weekend and see if I get anywhere.
I got the GLQuake installers and also various patches, so hopefully it all works fine. The Windows games all work without a hitch (G-Police, Turok Demo, Incoming, Forsaken, Tomb Raider, Quake 2, Unreal, MDK 2 (really slow though, might get the first one), Grand Prix and I have Messiah, but that one is a bit too new I believe.