IMO there's a limit to how far you might want to take that "This is what would happen if they were on their own in the wild" because, well, they aren't.
But I don't know about raw and kitten this age, just haven't seen anything on it either way.
Freezing is sometimes useful, but salmonella survives freezing.
Sourcing chicken well is key; if you can get local, organic chicken straight from a good butcher or farmer's market or the farm itself that is likely to lower the chance of salmonella greatly.
Also, do a variety of foods, not just chicken, chicken, chicken.
Having some cooked foods sometimes won't hurt anything either. True whether you cook it or if we're talking commercial.