It doesn't make you anonymous. Torrent protocol wasn't designed with anonymity in mind and there are a million ways you're going to leak your actual IP address.
Tor is a TCP only network.
While this doesn't give you the anonymity you wanted, it will hurt the network for other users.
Isn't it dangerous to have every client also be a node? Sure, my torrents would come out someone else's node, but someone else's torrent could easily come out mine.
I don't think my ISP cares whether it was actually me who used my IP to get a piracy complaint?