Hum,
i found that there are a lot of cases are quite flimsy and the internal metal parts sometime vibrate/resonate with the cd-rom or fans, - cured with application of strips of old mouse mats...
Is it not possible to `levitate` the case with a few magnets and a few coils? (the idea is that you just attach soft/normal rubber feet to the bottom of the case ) and reduce the weight of the case on them with a few repulsing magnets/ coils - The feet would absorb all the vibrations...
i suppose floating it on silicon-oil is out of the question?