Mimicking my 2 yr old "But, I wanna!"
Ok, thanks for that info nameeri.
Any suggestions then? I was planning on mounting my "unit" (still in development phase; either Libretto100CT or iPAQ or small laptop monitor) just in front of my vents in my Volvo V70, and I would like it to be adjustable and pivot to face the passenger. I am going to swap-in a single DIN HU and use the open space to fashion a plate onto which can mount a bracket, 9-inch arm, then the pivot VESA head. The VESA head I thought would be ideal for either the Libretto or laptop screen (with mods), and wanted to know about the future-upgradability to a Lilli or Xenar (or other) keeping that same mount.
Pic of my planned install

Pic of parts to be ordered (note how some are were just carted out of interest)