Sorry, but I had a similar reaction as Mac128 when I interpreted the post as gutting one Mac for parts use in another -- especially if the Mac you gut is in good working condition (or could easily be fixed to make it in working condition). As to the comment about people being "welcome to do what they like with their own property," I would ask you if it is okay to beat your dog to death even though he is owned by you. Your response would of course be "no, but a Mac is not a living creature." Even so, some of us here are so attached to our Macs that we treat them as such. Hence, you will often get a response from us that resembles how we might react to news of a dog-beating.
With that said, I am intrigued by this thread, if actually it leads to some specifics on what we must do to get a SCSI drive (or processor direct disk -- like the HyperDrive) to work on a Mac 128k or 512k with the original 64k ROMs. But in the end, we might have to recruit Andy Hertzfeld on this project before anything usable materializes. (Andy is a geek, but perhaps not geeky enough to do something like this. But personally, had I a similar experience and if I had spare time now, I would find it fun and interesting to work on a challenging project for a device I played an integral role in building some 25 years before.)