I like your mock up - very realistic - but now you have to think of form and function...

I would bring the ports down to lower right, and add a headphone port or something. Also, and it's only being picky, if you were to have the Apple logo turnable (ala PS2) that would work - this way, you're not limited to upright operation, you can place it horizontally and get the best from the drive. (I also think - judging by your dimensions, that if they kept similar dimensions on the displays, it would fit neatly in the curved space between the legs. (Also, power button needs to be on the front as well. I would take design cues of the front panel from the G5)

I reckon this could sell if Apple were to produce it - it's sorta like a semi portable machine, would be nice for Network parties - and with these new flexible LCD displays - could be the start of some new micro tower PC's with the portability of a large laptop, with the power of a minitower system...

Interesting.