This guy explains a bit, but not sure if you can see about the 4 pin supports ?
I'm also unsure to go with Shapeways or Paragraphics etch set. They are both pretty expensive, but do look cool. I've only just started, but I'll be very interested to see which way you go and hopefully a few pics and words on the installation. :-)
At the moment I'm tending to the etch set though, as you also get other detailed stuff for the nav computer, archway etc