I would suggest that you create one example multi-layout source with a few pages of Lorem Ipsum, with several chapters, subchapters, TOC, a few footnotes and references.
Then we might think about automating creation process.
There are a few "self contained" LaTeX environments, like MikTex - do you might have a look.
Important question is, how much portable do you want to make the system. Should it be portable across the entire Win, MacOSX, Linux, FreeBSD environment?
Another idea is to take a format, like FB2 and make a parser that would create LaTeX source .
Would it be feasible to use Scribus? - An opensource program that would like to be an inDesign alternative.
http://wiki.scribus.net/index.php/Wo...h_latex_frames
Final thought. We should not start "big". For the begining a simple system that would create just one format (display size) with support just for chapter headings and base text would be enough.
Disclaimer:
I do not really use or know LaTeX. LaTex is just at the top of my "To Do" list, and has been there for more than a decade ;-)