One more thing to consider, in reference to the "scrawny look" you describe, is that these birds are much heavier than they look. Their bones are denser and not hollow, and their feathers are hard and tight to their bodies, you aren't seeing the fluff that you would see in the barnyard breeds. They have a lot of muscle as well. If you could get an Oriental to lay down the fat that some of the other breeds have, it wouldn't be hard to push the known limits of chicken weight, but their gut systems are a little different, and they don't get fat the same way as other breeds. I have seen pictures on another site of a Kulang Asil that was supposed to weigh over 20 pounds. looked as big as a turkey. Probably took him at least four years to get that big, these birds take a long time to reach their full size.