I want to take the ATX PSU from my old QuickSilver first and see how the machine runs. if it works properly, i'll do the same thing I did with the G4 and just grab a 20 to 24 pin adapter and rewire it. The QuickSilver PSU doesn't even have a 24-28v rail in place, it just uses the standard trickle charge from the ATX's TRKL line to start it up. It's been running solid like that for about 12 months, however ADC on that machine no longer works. FireWire still does if I recall correctly, although I wasn't able to make it go into target disk mode a few weeks ago (which is a little odd and probably an unrelated issue).