Hi, I'm working on a new extended mod since two months ago, changing everything, but I want to change the source code too, spells, interface, etc, Its done, but where can I put this carpet (Arkane's GNU Source code) or archives to see the changes in the game? I cant found it, anyone knows the directory or how to do?, thanks sorry my bad english

I think you could look at the wiki of the Arx-Libertatis team. Tthey are very friendly in the IRC, too.

http://wiki.arx-libertatis.org/Main_Page