When there is totally no interest for this machine this baby is going into the trash.
The graphics board(s) could be removed and don't take up much room while waiting for a new home. The RAM is useful in other machines; the DEC 3000/300's and SPARCstation IPX come to mind. Narrow, 50pin SCSI drives are getting harder to find, and again the tray/sled doesn't take up much more room...
Hopefully it finds a new home intact, but if not and you can't keep the whole box around, these parts may be easier to trade.