It's for anything d'Uccle related.
Yes, I keep mine inside while their foot feathers are still bloody, but they do hollow out in about three weeks and then they can go outside again. I usually pluck all of mine out when they're molting so they come in at the same time. You can also try dipping the feet in mineral oil every night, as well as being good to keep the leg mites off it keeps the foot feathers very soft and flexible. An apple cider vinegar rinse will also work pretty well.
As for me, I hatched out two Gold Necks out of my GoldNeck Booted / MilleFleur d'Uccle pair a few weeks ago, and I think it's a pair! The boy has crazy long vulture hocks, I love it.
The hen got out of her cage, however, twice I believe, so unfortunately we also hatched out at least 3 mutts.
Well, at least they're cute.