That isn't really what he's looking for Jubby. That's ROM hacking, he wants Gecko.
After you create the GCT, you need to put it on your SD Card, in the "codes" folder. Then, run homebrew, then run Gecko.
That should be all you need to do.
My thread is three years old? WTF.
One second, let me update some stuff.
Here's a wiki with the gecko uploads. http://wiibrew.org/wiki/Gecko_OS