I am jealous of Zephyr Hill’s headgate.
Matron of Husbandry looking at her year of rotational grazing. I really like her posts on grazing on her farm.
We’re designing a very simple pen system (with a chute and a headgate) and the best of the documents we have looked at is this one on low-stress cattle working facilities from North Dakota State.
In France you usually buy French materials, like the stuff they have at Pasdelou Galva.
And some spider webs on the pasture:
grasspunk.com 
We’re glad you like our headgate! Thanks for the link to the low-stress cattle working facilities. Our head gate isn’t hydraulic, but we use pears, feed, and chin-scratching (not that last one for Sara!) to try to make it low stress. 🙂
Reading Matron of Husbandry’s post, I’m half inspired, half intimidated! Maybe we have been making the electric fencing too complicated . . . We’ll have to rethink that.
I’m sure pears would make any headgate work better!