The idea/practice of swapping frames and motors around in the "altec family" isn't exactly new. I'm aware of more than one fella who has purchased non-working C and D model 604's, and painstakingly repainted the motors along with 16 inch frames from broken 421's, and effectively put together 604-8G clones that would be difficult for the typical buyer to discern from the real thing.

I suppose it was only a matter of time before they did it in the 12 inch frame.

How many 12 inch cone options currently exist? Various cones would make possible a range of "voicing".