Yeah, do like I do and start cutting away. I added a side panel window on my Nikao X-Jazz (http://www.tradexinfo.com/case/xjazz.htm) with a 120mm 104cfm/45db fan, and I modded the front panel (behind the door so that the intake fan can get air, and will be modding the front door on it too for the same purpose (whats the use of a Vantec 84cfm Tornado if it can't suck air?!)... also might be adding 60mm intake on bottom of case, below slots. All you need is a Dremel rotary tool and some cutoff wheels or cutting bit, or a jig-saw, or a lot of patience and a drill and metal file (i've done it all).
Ahhh! It's 2003 and wait, whats this!? My computer didn't blow up! ... Well damn, there goes my new Athlon @ 333FSB and my inssurance claim... heheheh