I'd like to my hands on a Mac 128Ke for some experimenting. I actually had one of these back in the 90's when I owned a few 128k's. I remember being disappointed that it wasn't a "pure" 128K! Needless to say, I don't have it anymore, and they are almost impossible to stumble upon.

Which leads me to my question about creating one. Apple sold a kit for the Mac 128K and stock Mac 512K that included the 128K ROM and 800K floppy drive. They also had a kit for fully converting them to a Mac Plus, but the lesser upgrade did exist.

Shouldn't it be as simple as procuring a working Mac 128K and a Mac Plus, then swapping the ROM and Floppy drive from the Plus to the Mac 128K?

Is this particularly hard to do?