While that's possible, why not just get an Antec Nine Hundred? The case can work with liquid cooling and the top fan is great. No need to mod that case. The Antec Three Hundred is good too. See the following:http://www.xbitlabs.com/articles/other/display/antec-case-roundup.html
I was considering modding an old, but sturdy, RAIDMAX case that served me since the Northwood days, but decided to get the Antec Nine Hundred instead.
If you just don't want to get a new case, but enjoy modding them, then a hardware store's the place to start, or ask at the build your own area if you live near a Fry's (they'd probably try to talk you into buying a better case too).