Okay, as promised, here are some pics of what I'm working with...
This is may center console. There used to be an Alpine head unit in there, but then I came across this Scion OEM head unit that is more powerful, sounds better, and has better iphone/ipod integration. I'd like to keep it in place and utilize AUX function to take sound from the carputer, but I'm afraid there is nowhere I can put a monitor in this car that I can think of that will not require removing the HU. The vents (which I don't plan on removing) almost touch the top of the head unit, and the climate controls are cable style and so near impossible to move (let alone I couldn't imagine where they would go)
Here is the top cubby and the glove compartment on the passenger side. I originally was thinking of cutting into the back wall of the cubby to place a mac mini (if I go that route), but it seems the back wall of that cubby is integrated into the ENTIRE dash, so it may be more work than it is worth. The glove compartment is easily removed, and there is quite a bit of space behind it, so it may be a good location. Otherwise I'm thinking under the passenger seat.
There is the same cubby on the driver's side, but integrated the same way
Since keeping the HU would mean using the AUX to pull PC audio and losing it will deactivate this jack all together, I'll likely pick up a couple of blanks for the hole for the AUX jack and fab a USB jack into that spot
If the back wall of this pocket on the left of the AC controls is able to be removed for fabbing, I'll be integrating an iphone/ipod into it. As you can see, it's already the spot I use for this purpose, I'd just like a seamless OEM looking dock I can slide the phone into.