What's your plan?
good board to look into for such system's is the via micro-ITX and nano-ITX. QUOTE]
My original intent was to build the smallest PC possible.
The problem with building a custom case is that the power supply, no matter how small, will still be too big. An external power supply might be an option.
As for the ITX boards, newegg doesn't carry them. Some micro ATX boards are only 9.6 x 7.6, so I can't imagine how much smaller an ITX one could be.