Have original book which has some damage to the black cover. Also have fat and slim backs. Have Comm slot riser with Ethernet card.
Also have Apple External Video Connector which allows for connecting to an external monitor.
Most likely will run with fat back with Apple Comm Slot II Ethernet card added.
Took Crescendo G3 400MHz upgrade from 6500, also added PCI riser from 6400 and USB PCI card from 6500. The problem with the PCI riser is that one slot is blocked by the HD and the other is unsupported without a plate for the fat back.