If you need to connect them physically, I think you're blocked by HBA chipset support in macOS.
There is a path, but it's not what I'd call "good". Thunderbolt to Firewire to SCSI. It's a dongle Rapunzel and you're reliant on device enclosures for power.
May be better with a native PCI-e or PCI HBA and 700W power supply and a junker ATX Linux machine to provide network shares.
You could do "network shares" as in mount the filesystem from Linux and export over Samba/NFS/etc; it would probably also be possible to export the drive as an iSCSI device and mount HFS(+) filesystems directly from the Mac.
I considered the Linux box solution, and fear you're probably right, but it just feels like such a waste... for something that should be so simple with all this Mac Book horse power and Thunderbolt interfaces.
> May be better with a native PCI-e or PCI HBA and 700W power supply and a junker ATX Linux machine to provide network shares.
Agreed. Even if it's possible to get a combination of adapters to allow a SCSI interface to be attached to a Mac (and assuming the correct driver support is present), I think getting an old PC and an old SCSI adapter card may be cheaper.