Hi,
I've been thinking about doing this exact same thing-raising guineas and blogging about it. I ate them in Ecuador and I thought they were pretty good. My dad's ecuadorian, and of course, his mom had the best recipe for cuy. They keep them in the house there, and there's a general belief that they're little bad-vibes sensors, so if someone comes close to your pigs and the cuys start freaking out, beware of that person.
I was also wondering how you plan to dispatch them. Best of luck!