At long last, I have the Super Duty truck mirrors on the van...
The plastics turned out pretty good for a first attempt (after an exhausting multi-step process for finishing, texturing and painting). I don't have all of the functions wired up to the switches yet but I did check that the motors were working and they fold/extend like they should.
The real pay off of this project is that visibility out of these mirrors is INSANE!!! The old mirrors just don't compare. Shame on Ford for not updating the design for the vans.
I explained on another forum that these are just far too involved (and expensive) to make any sort of "production run" so at this point I have no plans to do more of them. Sorry...