From your list, I know that no one's attempted a Zoids Chaotic Century/Guardian Force Abridged yet. There is one team trying it, but they haven't created an episode yet.
However, I wouldn't advise shopping for an anime to make a full length series parody of. As I said before about continuity, you have to be aware of some very subtle nuances and themes, and that's something you can't really pick up as a casual viewer.