Two months after getting this, it finally got into the nets last night.
I think my verdict on the bat mapping is "good stuff guys". The B3 "powerbow" proved to be a very nice bat. According to the fellow forumites who had to out up with me trying to smash the leather off their bowling, the bat was performing really rather well, and they were impressed. I was too.
The only bad thing wasn't a b3 problem. After rolling the edges on the bath and bashing them for 45 minutes, I mistimed a full blooded swish and connected the edge of the bat with the seam. It has made a bit of a compression crack which needs glueing and a hammer edge face sheet applying. Oh well