Funny thing is, I actually have a hole saw too... But, I don't think I have one quite that big. The largest I have is about the width of a soda can. It's okay though, I like the look of a mutilated case. As my art teacher friend would say, "It adds character." :P I'm looking at getting a stainless mesh screen for a filter on the side, though, because I like the way the brighter light of the side fan would reflect through it.
I might be cutting a hole through the front cover of the case at some point, on the bottom where it says, "Acer" because there is a mounting bracket there on the case for another intake fan. If I do, however, it will not be until after a new motherboard.