I did the twin psu thing a while ago with 2 300w's. I had a much smaller case so i mounted the psu's underneath my pc as a pair of feet.
I'm now using an old server case that's well and truly modded with a fair few mods still in progress. I cut the one piece cover in two so that 1 side is removable, cut 2 windows in it, and well and truly lit it up. I'm now in the process of making a new front for it, I've cut the entire bottom half off and am going to fit the front of a small case to it so that it has a sliding door to cover my fan speed controller and all the switches.
If anyone is interested i will see about getting some pic's of it.