I never thought this would possibly work but decided to try it out
I have the upgraded Shuttle PC-50 300W PSU installed which is rated at 21.5A between the dual 12V rails - powering an X2 4200+ @2.4ghz, 8800GTS OC, 160GB raptor, 1Gb Kingston HyperX, X-Fi and an NEC DVD/RW drive.
The system boots right up just fine and chugs along with no issues under heavy loads from 3DMark05 / 06 and gaming with BF2142.
I did have to dremel away a small section of the rear side chasis frame and of course I used a window modded case cover that I had cut previously to fit a 7900GTX.
Now I'm seriously considering buying an SD32G2 Shuttle, so that I can use my C2D E6700 with the 8800GTS