cool!! Good find John!!! :hug:
Basically this is exactly what GM has done starting in 2003 on the GMT-800 trucks and SUV's; having a central BCM and various 'nodes' networked with it over the class 2/J1850 data bus. From the 2002 to the 2003 model year on the GMT-800's (when they had the mid-cycle-enhancment and went to the data-bussed central body control system) I think they cut out way over 100 feet of wiring from the truck...not to mention all the neat capabilities that wouldnt be possible without a data bus system, such as linking a different set of radio presets to the "driver 1" and "driver 2" memory settings, etc...
Probably a little expensive for the average hotrodder, but definitely neat and if I had the money, I wouldnt hesitate for a second, using one of those widgets in a build.
ben