A whole carcass is great, as long as it's feather and organs and everything, but it seems like an awful lot of food! I'm assuming you mean just... a dead chicken, and not the kind of thing that you can find at some markets, where it's basically bones and cartilage for making stock.
I try to feed my dogs about 2% of their body weight per day on a raw/home-cooked diet. That works out to just over a pound a day for my dogs, who are between 50 and 60 pounds. The average chicken is, what, four or five pounds? That would be enough chicken for a 200-250 pound dog!
(Plus, I like to feed my dogs veggies. Not a lot of them, but more than you'd find in your average chicken corpse.)
Personally, I disagree that premixing raw or cooking meat destroys its healthfulness that much
. If we were talking about frozen and thawed meat versus something that was just killed, then yeah, I can see that the enzymes would be destroyed by freezing. But since most of us buy meat from the supermarket or butcher, and it's been dead and packed in ice for a while, I just don't see what the big deal is with keeping it dead and frozen for a bit longer.
I think as long as you and your friend can provide a good food with a minimum of preservatives, now's a great time to try it! Raw feeding is very popular, but a lot of people are reluctant to try it because it seems too complicated or "icky." If you can market your product, and get it out there, try it! I think it's a great idea.