1/2" is no far too wide at all.. I cooled my cpu, gpu and nb in an sn25p all internal with 1/2" ID.
Mind you if I can put my pompous hat on for a second I do know what I'm doing, plus the downsides were a bit steep, like having no optical drive and having a 120.2 poking out of the roof.
Also I had to make a custom hold down bracket for the cpu block because the shuttle mounting holes are proprietary.
All that given to be honest it wasn't worth it. The hassle for the increase in performance just didn't add up. For example if something leaks, or you want to change anything you're talking half a day to even get in the thing let alone move anything about.
If you really must I would probably suggest something like a reserator, at least then the meat of the system is outside the case and seeing as it looks nice you shouldn't have too much of an issue seeing it and finally it carries on the shuttle tradition of being quiet. Once you start sticking pumps and big fans blowing over rads/blocking up the psu exhaust fan etc you really start to hear the shuttle which makes the exercise pointless.
I even put a window in see
although check out what you end up with inside the case, its hardly what I'd call n00b territory (your self description, not me having a pop
)