calling all opera/musical engravers

[Kieren MacMillan]

Hello all!

I would love to hear from anyone who has engraved a full opera or musical (with 
at least vocal score plus full score) in Lilypond.

Specifically:
1. Is lilypond-book the only sane way to do it?
2. What functions/extensions/tricks did you use to bend Lily to your will?
3. What pitfalls are to be watched for (and hopefully avoided)?
4. What limitations cannot [currently] be overcome?

Thanks,
Kieren.