im using the case of a siemens PC5DT server.
its really really really heavy, even when empty.
on top of that with all the hardware it gets even heavier.
next week im installing my new WC rig, im estimating that it will weight as much as 4 kg.
to compensate all this weight im installing a really big handle on top (directly attached to the chasis), and a removable base with big rubber wheels.
this wheels let you drag the case all around (they can run over almost any obstacle as high as 1cm), you just have to lift it off the base when you want to put it on a permanent place.
moving my case through some stairs without someone else helping, is not an option.
ill post some pics tomorrow