Use this:
http://www.swbfgamers.com/index.php?action=downloads;sa=view;down=525
It's the most organised modding tools by far and probably it will help u.
Go to 1.2 Side Builders or something like that and follow the instructions Led posted
These are good mod tools, but I am splitting this off so that we can keep making progress on the installation he already has. If we have to, we will get back to this.