So, I know I've been a little quiet of late - work has been hard - but I've managed to get some progress on the #powerbook5300CE and #PiScsi.
Looks like the Raspberry pi 3 I had didn't like the hat, so I switched it for a Raspberry pi 4 that I had attached to my 3D printer.
It's not a long term solution, but I was able to nuke the HD and reinstall System 8.6!