I got a mini-itx case and a DC-to-DC power supply, which is 5cm wide (typical seems 3cm, but this one's 200W...). It won't fit into the power supply mounting pins in the case, so I'm considering just using cable ties to tie it to a HDD bay.
It is a power supply, so I'm concerned about shorts. (I guess I would still be concerned for the component if it was anything else, but doing this wrong might be personally dangerous.) Would, say, a sponge between the PCB and HDD bracket be effective? Is this a really bad idea?
The case is a Viako Mini Self. It's got a HDD mounting bracket that kind of floats above the motherboard (it screws onto opposite walls of the case). You can use acrylic pieces but mine are all aluminum.
The power supply is the fourth item on this list: a Modcom ST-DCP 200W (sorry, can't seem to find an english version, or a static link to the item itself).