Are you going to send it to the lilypond developers?

I'll let them know about it. I'm guessing they probably won't adopt it as a replacement for their own (though they're welcome to do so, of course, or to nick whichever parts of it they like), but I would at least like to suggest one or two small changes to LP itself as a result of the project.

(Most obviously a command-line option to make it easy to drop in a different font, now that a compatible one exists. Also I had to put in a nasty hack to get the time signature digits correctly centred, and they're still not quite perfect; a small change to the layout algorithm would be a better solution and enable me to take my nasty hack back out.)