Ok, I just installed this mod on 1.6, and I similarly wanted to have Kerbin as my home planet.
After some testing the files you need to delete are the planet config for Gaia
Next you should delete OleiModGaia in the scatterer/config/Planets folder if your using scatter, Not sure if this will do anything but if your using the scatterer mod its probably safe to delete it.
Finally you need to open the GPO.cfg with notepad and delete line 3 where it says !Body[Kerbin] {}.
You could delete the other planets which presumably will add them back into the game but I have not tried it so I'm just guessing at this point.
That should add Kerbin back into the game, do this at your own risk.