I've found and bought an LCD panel.
Not TFT, unfortatley, but STN LCD panel.
Here it is
It is intended for a PS2, and they claim a 130degree viewing angle.
Takes a 12V input (will run from the PSU 12v line).
tried it with the DVD player at home using a VCD, sound through the speakers acceptable, picture not bad. Will need to work hard on getting the angle right though.
As it is 7.2" wide, and contains speakers, it is a very wide case. As I plan to run sound through an FM modulator, not the screen speakers, I guess I will be chopping the case down, and possibly filling the gap with a section of sheet MDF painted in satting black to match.
I have had the case apart, and can't go as Narrow as I would like, as board below the screen runs quite a bit wider than it.
I'm going to modify the Hinge stops to allow me to fold it back further than present, and also narrow the base. Biggest problem I reckon I'm going to encounter is getting it high enough with it obscuring the road. Had planned to completley recase it, but that will have to wait for now.
Next thing is a touchscreen. Any idea if the DigitalW 7" touches will work with a 7.2" panel?