Building muscle on a plant based diet

I posted this a while back on the vegetarian forum, but it didn't seem to get any replies or comments.  This forum is at least geared towards lifting and muscle building.  Plus I know we have at least 1 vegetarian on here who's interested in building muscle.

The set of articles is by Dr. John Berardi.  He's an omnivore who had a vegetarian ask for advice on building muscle.  He decided to see if he could put on muscle on a vegetarian type diet. The details are shown in the following sets of articles.  Overall, he was able to put on 7 lbs total (5lbs lean, 2 lbs fat) and came away with some good lessons on eating.  I read the original article on t-nation, but his blog is on the precision nutrition web site, so there are some plugs for their system.

The first article describing how he was challenged to experiment: JB Goes Vegetarian

The article outlining his results: Wrap-up and summary of Johns experiment - photos, stats, conclusions

Two good articles he wrote during his time as a "vegetarian" with some lessons he learned:

Lessons meat-eaters and vegans can learn from each other

Meat, is it really bad for you?

Overall, I think it's a good set of articles with some valuable lessons (like leaning towards unprocessed foods, and getting in lots of vegetables) for those looking for a healthier style of eating, vegetarian or otherwise.