> The internal hard drive uses SCSI with an unusual connector.
This is literally never an issue as old connectors are easily obtainable (in particular 'in this day and age').
> Adapting it didn't seem straightforward, and we weren't confident the old file system (HFS) would be easy to read from a modern system.
Simple search pulled this up. Honestly that reason didn't make any sense to me at all. The other way might be interesting and fun but I don't think this is a reason not to attempt mounting the old file system.
https://www.matthewhughes.co.uk/how-to-mount-hfs-classic-dri...