For a while I've been gearing up to do something nasty and entirely unpractical, and one avenue I'm exploring is to get a 4-500W SFX PSU and ditch the casing and the included fan. My understanding of electricity is very rudimentary, so I wanted to get a sanity check before I find something out the hard way. Provided that I can resist the temptation of licking the unit while it's on, and I use standoffs so that I don't ground out the PCB with the PC chassis, is it viable to forego the casing or is it important in terms of shielding to protect either the PSU itself or the rest of the PC from some kind of interference? Is there anything else I haven't considered? If I go down this route I'm thinking I would handle the cooling by mounting the PSU board near the case intake fans. I could run these either at 20% minimum PWM or turned off when the PC is idle and then ramping as load increases.