Although I always swear that I will never work with a Model II again, I also can't stand not having a working system lying around, so I assembled a "Frankenstandy Model II" from parts. Lesson learned - don't use Gorilla Glue to attach keyboard replacement pads. That said, it's good to have a working Model II again. I also have a working expansion drive system with three drives. Two work reliably, the third needs some tweaking.
So...would it be much trouble to migrate some model III programs to the Model II? Wonder what's involved???