Phase III - Case Mod
 

I know, cubes aren't exactly 100 percent original - but they're still one of the most popular and yet least done builds - and the smaller they get, the less of them you see. I'm sure a part of that is due to the difficulties inherent in fitting everything, as the cube shape almost requires the motherboard to be in only one of two places - flat on one of the faces (and facing inwards), or dissecting the middle.

http://www.bit-tech.net/modding/2008..._iii_by_cc3d/1