According to EveryMac, the PowerComputing models mentioned above had a case option for either desktop or tower. So, more than likely, the unit being discussed is simply a tower version.
http://www.everymac.com/systems/powercc/
The PDS slot is kinda interesting...the old Apple IIe emulator cards used this slot (but unfortunately, this card apparently doesn't support 24-bit addressing which means it only works with older OSs and older Macs). The PDS slot is more commonly used for ethernet cards.
http://kaminski.branzone.com/pds/
As you are no doubt aware, Nubus systems are not in high demand and not many people are going to pay more than $50 for it. The model in question doesn't have a daughtercard slot for CPU upgrades, although I guess a Nubus-based processor upgrade will work...I peronally think you'd be better off finding a PowerCurve, PowerCenter, or PowerTower and upgrading that.
Similarly, the PowerWave model had an option for 2 PCI slots *AND* 2 Nubus slots.
http://www.everymac.com/systems/powercc/powerwave/powerwave604_120.html
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