While impressive, it would have been a lot easier to just use a SCSI connected Ethernet adapter. Correct SCSI termination would have required sacrificing a chicken and drawing a pentagram in blood, but still easier than this project.
The trickier bit would be to find one of those old SCSI-attached ethernet devices (Asanté, DaynaPort, EtherMac, ...) since they're coveted items in the retro scene. Although it looks like at least PiSCSI can emulate a DaynaPort https://github.com/PiSCSI/piscsi/wiki/Dayna-Port-SCSI-Link