Bresse on it's own is a wonderful table bird and a good layer. Cornish x would make it bigger but less sustainable. I too question what people are referring to as sustainable here. In my flock it means the birds breed naturally and raise their own young year over year. On the bird's part that requires fertility, laying ability, health/vigor, longevity, broodiness and mothering ability. On the human part a lot of management and planning is involved. Inputs for a meat flock are a balance. If you want them to grow fast, they need more than they can forage. If you want them to feed themselves, they need time to grow. Our birds take time to grow but we've had a closed flock for 5 years now and there's always chicken in the freezer.You are completely right on both statements. Any breeding project will test your patience. Especially if having to overcome inferior genetics. I have too many other irons in the fire to give it any serious attention. I am curious of what kind of table fowl. A Cornish x American Bresse cross would produce.