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Yes, just copy the files as instructed and you will have these models instead of the vanilla ones. :)
The Star will be Quetzal Leap, we don't want another chainsaw wielding idiot around, especially if the animations aren't there. Quetzal was pretty friendly, liked the contract and will be hopping around as soon as we're done! :)
You're right, there is no SDK, you can however use Nifskope to get the 3d Stuff imported/exported, DDS converter for 2D, and many things are handled by XML files, so these are accesible as well.
The database can be handled with a standard sqlite manager. :)
They were initially designed to be a strict running team with a specialization in intercepting the ball. If you manage to keep them alive long enough, you should be able to build a great passing team though.