PlaneJob,
I've been working to do the exact same thing on my Insight, and gave up
long ago on finding the Japanese dash piece for same reason Rick suggested.
Instead, I purchased a replacement dash piece from my local dealership
and put together my own double din dash piece.
I used styrofoam and sandpaper to create an outline of what I was wanting, and duraglass/fiberglass did the rest.
I've spent last few months working on this in my spare time, and completed the dash piece about two weeks ago. A friend of mine is
stitching up some black vinyl that will be applied to my dash piece later
this week, at which time I can upload some pictures.
The radio I have installed in my Insight is an Eclipse 7301 double-din w/video, and I have used an i-mac-->to-->scan converter to display my
desktop in the imac.
I'm working on removing the logic board from the imac, and either building/modifying a power supply so that It can be permanently installed in the car.
My first goal is to have an iTunes jukebox, and then possibly GPS at a later date. (and of course, some war driving!)