Hi Brivime,
Gotta say what you got here is very impressive. I managed to get it working by following the following steps (would love to know how you made them selectable, btw)
Basically in startpos.esf there's a section that you shouldn't change that you did. "CAMPAIGN_STARTPOS/COMPRESSED_DATA/CAMPAIGN_ENV/CAMPAIGN_MODEL/WORLD/FACTION_ARRAY/"
is the directory of it.
Don't worry, I made the same mistake too in my experiments. That section is a no fly zone evidently.
Here's a fixed pack so you don't have to go looking for what you changed.
http://www.mediafire.com/download/kt...dplayable.pack
Oh, by the way, in testing to see if it works there's no family tree as far as I saw. The faction in theory is still playable though.