To connect the Outbound to a Plus or SE as described in the article you need a docking card installed in the host machine. I've been hoping to find one of those docking cards for 20 years now. Chances are slim. A Mac with the docking card installed can't boot unless connected to the Outbound (no ROMs) so anyone finding a Plus or SE with a docking card installed is likely to trash it as a non working machine, unless they have more than a casual interest in the machine.

All that said, with the SCSI adapter, one can boot the Outbound in disk mode and it will look like an external hard drive to a Mac connected through the SCSI port. Not ad cool as the docking card but the earliest example of disk target mode on a Mac.