Hundreds of animators for something only 23 minutes long?! I mean, that's still a lot longer than the average cartoon, but not feature length. I don't know that much about FLCL. I didn't know it was considered a classic! Anyway, this looks amazing. Anything that that many animators work on is worth watching.
For a trailer, it certainly looks amazing. I liked that last joke with the crow. It was so great to see so many styles so quickly. It's hard to tell what the best animated one was. I wish you luck on this!