That's a good question. It irritates me to heck that they don't finish the Challenger. It seems like they have one episode every 6 months where they work on it. As to your question, I can't think of any others, either. They might have finished that sleeper Nova (?), I think they called project Blue Hair. It seems like they've started about 6 or 8 other projects since the Challenger. The only reason they actually finished the crate Camaro was because it was part of a promotion that they sold off (raffle or giveaway, I can't remember).