Minor update: I've acquired an authentick PS for my PTPro 225 shell, so I can at least fire it up and check the logic board, given that I have RAM, HDDs and daughter cards enough. My source of the PS has a fund of other parts, which he has undertaken to mine for machine-specific treasures for me.

This PTPro was patently intended for serious business. The PSU makes provision for eight drives in addition to the logic board.

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(60x) 13DT + 3PB + PTPro; (G3) 7DT/MT; (G4) 3T + PB. System 8.1 to OS 10.5.8