I designed a little PCB to use a 50 pin SCSI internally in a Mac Plus so that you can have devices like the BluSCSI installed internally all stealthily.
The files for the PCB are all available here: https://github.com/BigBadBiologist/Mac-Plus-Internal-SCSI
The installation process (not easy)...
I recently came across this Power Mac 5300 on FB marketplace. It's a decent all-in-one, but I wasn't planning on picking it up until I saw the back of it. Seems to have all the bells and whistles. I'm looking forward to playing around with this and seeing how well the capture works.