Lilypond, how it really work, Java & Eclipse

[lala lala]

Hello everybody,

I'm a new contributor to the lilypond mialing list. I'm a drummer and I 
discovered lily 2 years ago looking for a powerful tool to engrave my parts 
and the parts of my pupils.
It was difficult to understand and the first version I try didn't support 
drums notation. Today I use a recent version and with gvim and a bit of  
courage, I manage to obtain some good & beautiful output.
As you see, one part of my life is music; for the other part I'm involving 
into programming and specially Java programming and Eclipse plugins 
programming.
So I have a lot of question about Lily and I hope that is the good place to 
ask them.
1) Despite a (small) search in the documentation and without looking to the 
code, i didn't find a real description of how lilypond really work(parsing, 
conversion etc ...). I mean which functionnalities are coding in Scheme, I 
see some cc files in the source package. What are their role ?  What are the 
external program called by lilypond and why and when are they called ?
2) Maybe the same question, do you think that lilypond could be rewrite in 
Java ? and port on windows (without cygwin) ?
3) I see some comments about a JEdit plugin and I wonder if an Eclipse 
plugin will be interesting. For example an editor with code completion, 
syntax highlighting, refactor etc ... and maybe a kind of realtime output. I 
will try the JEdit plugin maybe it works well.
4) I have a dream. A real engraving software like lilypond but a little bit 
simpler (for novice), really cross platform, and a lot of parameters for 
experts and particular about layouts ... Do you think that would be possible 
?

Thks !

Lasconic