I like the idea of the pedestal thing but you should make it an extension of the original case. By that I mean keep the front pannel's shape and put a mesh bellow the phantom's mesh (as if it was part of the case).
I'm not sure wether or not having 2 480s in such a small place is a good idea. I'm no expert but I see how that could cause heating problems (don't think rads actually overheat / burn but I mean it wouldn't cool as well as it could) unless you plan to have the 480s seperated by a row of 4 120mm fans with the same rows on each side a bit like a Big Mc except the fans would be the bread (buns ?) and the steaks would be the 480 rads.
That should work fine (you'll need an expert's advice or atleast a better advice than a begginer's advice
Btw, why would anyone want to hide their rig under their desk :'( ? I'd rather have it either on top of it on my right or left (I can understand some might not have the space though but it's kind of a shame to hide your rig).Edited by steelkevin - 12/12/11 at 6:56am