The big difference is that I decided I didn't want to destroy my ATX power supply in the conversion. Another advantage is that you can just plug in a new power supply if the old one goes caput.
Drill and bits
Screwdriver ( for taking project box apart)
Desoldering iron (optional)
Label maker (optional)
A lighted 12V switch
3/4" strain relief
ATX connector (purchased or scavanged)
Miscellaneous heat shrink tubing sizes
Some wire 14-20 Ga (colors matching standard ATX if possible)
Step 1: Obtain an ATX Motherboard Connector
Desoldering components can be tricky, so take your time. The easiest way I have found is to first flood all the pads with as much solder as they'll hold. This allows me to heat the entire pad and pin evenly with the desoldering iron. I use a simple Radio shack model with a squeeze blub.