[Twisted-Python] UDP vs TCP for bittorrent-style file transfer

[Z. S. O.]

Hi list, I'd like to revive a topic touched on in the past. I'm playing with
python socket programming and decided I want to make a simplistic bittorrent
clone that uses UDP instead of TCP. My main reasons for the protocol choice
are (1) I don't need guaranteed in-order delivery, and (2) I need to get
around NAT restrictions without making the user manually forward ports.
Couple questions...

1. Are those good reasons to ditch TCP, or am I being an idiot? (Always a
possibility.)

2. Even though I don't need TCP's in-order guarantee, I still need an
ACKing mechanism to make sure all the packets eventually arrive. Is there
any (simple) code written that accomplishes this with UDP?
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