Any chance you can implemt parts of the "Sikkmod" doom3 mod ? It really pimps the graphic of the game. Sadly the mod
is only availible for windows right now ..

Maybe you can implemt it directly into your version or simply build the mod for Linux ?
This would be really fantastic !

Here is the link:

http://www.moddb.com/mods/sikkmod/downloads/sikkmod-v12

The source is included in the tarball.

Thanks a lot,
christiaj