Sorry too slow, already had them Lol!
I'm going to do the same as I did last summer for a bunch of heritage roos. They averaged between 4 and 5 pounds dressed. At between 12 and 16 weeks, I don't remember and I won't blow smoke. I would have let them go longer, but I didn't like what they were doing to my pullets.
For one I am fortunate that I work at a dairy plant and have access to a lot of free cottage cheese, my biggest saver. I also fed them all the fish my kids could catch, they love fishing. It was mostly pan fish, blue gills, ground them up with a old hand grinder, heads and everything. I Also planned on free ranging as much as possible. But right now with super cold weather I'm finding my egg layers are eating less now that they are not running around. The one new thing I am going to try is making fodder for them, with any grains I can find cheap. TSC has wheat seed for deer food plots at a reasonable price, and whole corn is cheap, add some bird feesder BOSS and I plan on growing some greens such as spinach, swiss chard and kale to feed them. I also have a pond full of duckweed that is supposed to be super high in protein. With the free CCheese plus everything else I think I can afford to raise some meat birds.
You are really resourceful....What a pleasure to hear from someone who has done many of the same things I have cooked up over the years....Keep it up!