Yeah, I finally got it working with recent versions of LilyPond!
(The most important change was from "linewidth" to "line-width", and  
I overlooked that far too long...)

The module still has lots of issues (e.g. paths for external command  
like lilypond are hardcoded), but it does what I want it to do. ;-)

Could someone please exchange the module in the garden?

Greetlings from Lake Constance!
Hraban
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http://www.fiee.net/texnique/
http://contextgarden.net
http://www.cacert.org (I'm an assurer)