Philip Smart

Not totally sure if the RMH in this video has a baffle style switch over but I would suspect that it does. This video is of a cafe in Japan and the summers are really hot and humid. I would suspect the during the summer it can be turned to just heat the hot plate and oven.
http://www.youtube.com/watch?v=ZuFOnjwOA2s&feature=channel&list=UL

Water heating with a rocket stove: I found these videos of different styles which seem to work.
http://www.youtube.com/watch?v=194QU0C5hpc&list=FLJRynazMzQnzgMC4hdAomKw&index=57&feature=plpp_video
http://www.youtube.com/watch?v=YTnr8ua54Uw&list=FLJRynazMzQnzgMC4hdAomKw&index=22&feature=plpp_video

There was another guy from Poland who lives in Bristol, England. He had got to the point of having on on-demand, mains water fed hot water from his rocket stove but he recently took all of his videos off-line. I think the heat exchanger was a thin steel water jacket (about the diameter of a length of scaffold pipe) connected to the water mains, this he put in a separate chamber, next to but not in the heat riser (which would cool the rocket down). He was making great advances, shame he has now gone off-line...

Good luck!