Here is a short guide for organising a large LaTeX project.
Here is a starting kit for such a project, implementing the ideas from the guide. Arguably, the
.sty file in the kit should be a
.cls file, since it contains settings for the document class
memoir. The idea is that users who want to use a different document class need only remove those lines.
For a version of the starting kit that is customised for doctoral theses at the University of Oslo, see phduio.