I had two PC Server 500s and one PC Server 720. They were way too bulky to keep around and are long gone. I did keep two PS/2 Server 95As since they are about half the size.
I happen to own a model 95 (non-A), but it was much easier to obtain in contrast to the PC Servers

It was 'fun' manually building a new SCSI drop cable since the MCA corvette uses a mini centronics on the card-side, which of course is an IBM-exclusive thing and not standard on any SCSI drop cables.
And you actually had a PC Server 720??? Ah sheesh. I guess I was born in the wrong era; they are now inobtanium, couldn't find any even in 2013. It would be a dream running multiple Pentium 1s on the Corollary C-bus II. And some models also had the dual MCA/PCI bus slots.
I'll just go cry on my IntelliStation POWER 185 :p