The question is, how many of these models exist today. My guess is 5 based on your information, what is yours? 1 seems abit pessimistic. I wonder if anyone has got a factual figure, maybe an ex employee of Commodore would know.
If it was buggy and not user friendly being the nature of a prototype, sure you could modify it to a functioning accessory.
1. Really? A team of Commodore engineers weren't able to fix it (and presumably made a new revision prototype to correct the bugs) and you're thinking it would be an easy fix?
2. Would you really want to decimate the value of an original prototype by hacking it so you could have a working CD1200?