Yes that link was very interesting how he hacked the mini and put it in a older case with regular size HD and CD/DVD.  But I'll stick with my factory built one.  I dob't notice too much lag.  
As for the cases the colorfull days were good.  B/W adn even my g4 sawtooth was good beofre I sold it.  But the new ones are nice too.
Actualy I still have a G3 desktop and Tower at home 2.
Also not bad.  A little palin btu not bad.
Thanks,
ivnj