@ mantisspider,
>Wasnt the X-Men Mod for Quake ported over the amiga a while ago??
AFAIK Quake I mods don't need to be ported to a specific platform as long as the main engine is not changed.
This mods get their special behaviour due to the built in language QuakeC (or so) - meaning that this will be interpreted by the engine.
QuakeII mods however are always platform specific as they are compiled during creation time.
As long as those mods don't change to much you might be able to play them using the gameppc.dll from QuakeII, however, you will certainly miss those extra features as they normally are needed for completion of the game.