It is useful to have a guide which explains how to build Continuum from trunk and run the webapp. I have written a new version of http://maven.apache.org/continuum/guides/development/guide-build-continuum.html. (It is outdated.)
The parts on assembly and the descriptions of the modules are useful, but I don't think they belong in this guide. These were thus omitted in the new version.
The guide was written after I just set up such an environment with trunk on Ubuntu Edgy Eft.