I am in the process of acquiring a Mac Pro case. It should be waiting for me in a few weeks. This is a new case, new-in-box Mac Pro case, not a G5. I am working on the wiring to adapt the Mac Pro PSU to ATX 2 standard but since I have not seen my PSU and Apple likes changing harnesses I can only guess until I get the case.
Mac Pro PSU -> ATX 2
MOLEX most likely makes these connectors, and if it does these would be it:
Front Panel wiring seems to be a PATA looking cable… More to follow.