Yes, our d'Uccles are Mille Fleurs. We drove about 2 hours away to pick up 5 hatching eggs from a breeder and slipped them under one of our own hens to hatch last spring. Of the five chicks, three were cockerels that we sadly had to rehome (roosters are illegal where we live). d'Uccles make wonderful pets!
A couple of things to think about. Yes, d'Uccles are a wonderful, sweet breed, but letting any chicken perch on your shoulder carries risks. Chickens naturally peck at anything shiny or interesting, and eyeballs can look shiny and interesting....we let our chickens perch all over us except for the shoulders (heads are even ok because poop washes off), but when holding them on our arms we don't bring them close to our faces, just as a precaution.
The second thing to think about is that because of the sweet and gentle nature of the d'Uccles, you'll probably want to watch out for whether yours get bullied by the other, much larger breeds of chickens you're getting. A friend of ours, the one who gave us our original five chicks, has a d'Uccle (the mother of our half d'Uccle hen, actually) in his yard mixed with standard breeds, but his yard is quite large and has lots of shrubs, trees and other hiding places for a bullied chicken to hide from her tormenters. A typical chicken run (empty of anything vertical inside the pen) would be very hard for a d'Uccle being harrassed by bigger, fiercer chickens. It looks from the picture of your greenhouse that the pens would also have shrubs, etc. in it, so that will help a great deal, as will being sure that there's plenty of room for the flock. And every once in a while you do run across a chicken with a vindictive personality, something that goes beyond ordinary pecking order. Last year, the top hen in our flock was Martha, a half Serama, half Old English Game hen. She had a vendetta against Billina, our half d'Uccle hen and our favorite. She used to chase poor Billina all around the yard even while free ranging and just would not let up. When we had to rehome our rooster after a neighbor's complaint last spring, we sent Martha along with him (because it's easier to rehome a rooster if he comes with a hen as a pair). With Martha gone, Billina eventually ascended to the top job, but she's a benevolent monarch and never gives her subordinates more than a couple of pecks on the back of their necks to keep them in line.
D'Uccles are also quite good fliers. Ours seem to leap/fly up before flying forward, maybe because they don't want to trip on their own feathered feet? Ours can easily fly 6 feet high, perhaps more. Something to think about as you plan your pens and what is to go over the top. You would not want the d'Uccles to get tangled up in fishing line, etc. Chickens do freak out about everything that's new, but get used to most things once they become accustomed to them. My flock hated the plastic tarp I got to go up to block the wnd on the side of the run last winter because of the noise it occasionally made in the wind or as I moved it. The 6 mil plastic I used this year doesn't make a loud noise when it flaps in the wind so they don't mind that.
I think it's great that you'll be getting your chickens from a breeder and not from a commercial hatchery; I expect you'll be getting better stock to start with that way.
