I use triangle shaped tractors made from 3/4-inch PVC pipe, hardware cloth, and painted plywood. The black bear could not tip the triangle shape, but certainly did get the corner up on the house-shaped tractor. The house shaped one now has pressure-treated 2x4 base, with four built-in nest boxes in a row in back ... oh, and about a week after the bear hit us we has electric fence netting as a perimeter. I only know of one other neighbor on this series of dirt roads who does electric fence (registered Angus and Lowline cattle) so the bear seems to prefer softer targets. I'll have a better idea of how well the electric fencing works over the next month, as she and her cub work on fattening up before hibernation.
Right now, I am doing small groups of breeders. My F1 GLWs are from one cockerel and three pullets. I have my "Meaties" as a group of six, another GLW cock, three pullets, and one black sex-link hen (the suspected dam of Bertha, the huge crossbreed pullet from the test mating), and I have five pullets who just came into lay that will soon get a breeding cockerel instead of the young yard ornament currently in with them.
I have a growing number of Silkies here to handle the main incubating, hatching, and brooding, along with a couple Ameracauna hens from Luanne, and so far one Ameracauna capon who is inclined to nanny/brood chicks. I now have an electric incubator, for "off-season" hatching and also in case Bossy decides to quit again.