Yup, you can pull the 5 volts from one of your connectors in the PC, just make sure it is 5 volts. You can google your power supply and find a pin out probably. I wont say the color of wire as I might be wrong. The 2 parallell ports will still go to your controller. I'd mount it in the bottom of the pc and use two of these in place of the PCs parallel ports.
http://www.pmdx.com/DB25RibbonYou can get them with the plates too, not sure if those in the link do or not. They will fit in the pack of your PC where you would srew the plate of an add on card.
Brett