Bulding Thinking Classrooms

Has anyone here looked at Peter Liljedahl's Building Thinking Classrooms? Part of this is to get students up on their feet workinbg in small groups in front of Vertical Non-Permanent Writing Surfaces (aka whiteboards). It seems to me this could be something of a challenge in a traditional-sized classroom with 25-30 students, even if there are some whiteboards available around the sides of the room. I'm keen to hear of any experiences people have had -- what worked well, and what were some of the challenges with this approach to learning?