As of right now, it's holding up, although I don't park out in the sun a lot. It's usually garaged at home, or in an underground parking structure at work. I did park it outside a few weekend back and the cabin temp reached 110 or higher and the computer still worked fine.
The monitor area is actually right above the air vents...the base is actually screwed into the hard plastic ducts it is sitting on, so if I do need to make some more air behind the monitor, I can just drill a hole in the duct. There is also a small vent in the back of the dome enclosure where the hinges are. Oh yea, and I painted the mold as well as the whole center area silverish so that it doesn't absorb as much heat when it's out in the sun. Damnit, I really need to get some pics up hehe.