It's a dodgy photo (out of focus), but there is a subpanel, lower right, that houses two 120mm intake holes. One for a fan over the PCI slots and the other for the CPU HSF intake.
http://www.gam.net.au/mods-main/snea...89.25a.crp.htm
(haha, my wife just popped by and had a look at the sidepanel. "What have you done? That looks st." LOL, well it does at the moment, as it is still covered with various protective/guide tape, pencil/texta lines etc. )

The following shot shows the original sidepanel mod where I cut a 120mm hole for the CPU intake and a 92mm hole for the GPU fan. I had the GB GA8i945p-Pro in the case at that time and the CPU was located a good 25mm or so further back. That hole well and truly took out the latch. I wanted it back (as I seem to open and close my case all the time ), hence all the fiddly, trial and error, work refitting the latch into the window.
http://www.gam.net.au/mods-main/snea...45.25a.crp.htm

@jimwah, I love powertools , but I get a bit carried away sometimes .
@smopoim86, there were a couple of occassions where I thought I'd totally ruined my sidepanel, like the first mod which took out the latch, and during these current mods. I've managed to recover though, fortunately .