looks very neat, as Antikz said, with the little switches. it'd be nice to see photos of the internals to see how its done.
a while ago I bought some Ericsson rok bluetooth modules for only a few dollars each, they're incredibly small (think postage stamp 0.3mm thick)... how I wish I had the courage to modify my 3100 to add one... having broken a 6000 I have lost confidence in modding