I slapped together a very similar machine back in... gads, 2001, and just for the heck of it ran A/UX on it. (The reason for buying the box was actually just to have a copy of a Quadra ROM that was "mine", for emulation purposes.) Cost me $40 for all the pieces from Weirdstuff and I probably overpaid considering what they were going for at the time. Whee.

Sort of, just a tiny bit, regret getting rid of it. The 650/800 system board is arguably one of the best 68k Macs ever made. Case sucks, though.