<< I would leave it as it is. The fan in the 300W Antec is not too loud and messing around PSU can kill you, even if the PSU is unplugged for hours, it still contains fatal voltages. >>
Darwin's theory at it's best.. if your dumb enough to lick your fingers and touch negative and positive at the same time 😛
Edit: On a serious note though respect the capacitors.. they hold a lot of charge for weeks.. leaving the PSU out and unplugged for a full day should be enough tho..