Hi, folks! I'm working on LegoBSD toolkit. It's a "simple by design, modular, easy for configure and extension toolkit used for building FreeBSD based operating systems for all sort of needs"
Project page located on SF.net:
https://sourceforge.net/projects/legobsd/. The project in pre-alpha stage and you can chekout sources by SVN. Soon, I hope it'll be ready to build m0n0wall from scratch and I'll show how!