Found an old picture of basically what I am thinking. I 'shopped this image some time ago. In this picture the radio has been replaced with the screen, but in practice I have decided that it makes more sense to place the screen in the spot above it where the heater vent, wiper switch, lighter, and idiot lights are. The wiper switch will be relocated, the lighter eliminated, the vent blocked off so it just relies more on the other three in the dash, and the idiot lights will be incorporated into the OBDII conversion.
The radio will then be gutted and changed out to knobs only so that if I choose to run the carputer blind for music as though it were a regular radio I can. Left knob volume, right knob tuning/track, etcetera.
Anyway, this hole (the top one) is just shy of being 4.5 inches tall (required for full viewable area of the eee PC's 8.9" display), but dead on for width. I just need to know a way to convince the PC that it has a smaller height, wider ratio screen.
Also, hopefully it is now obvious why I will not cut the hole larger.