Well, I can't upload any photos so I'll try again another day.
I may as well allude to my chicken tractor that is pictured and mentioned at the beginning of this thread. I have found that it can hold up to 20 chickens comfortably, if moved every week. That gives them a really good free range but you could fit a lot more in. Next time I'll use it as a confinement pen for the last few weeks. So I'll roof it all with tin and put wind breaker mesh all around. No need to move it as I'll bed it down with straw.
This particular chicken tractor has its major draw backs 1. It's extremely heavy, has to be towed with high power tractor rather than atv, Land Rover, compact tractor. 2. Due to its length/size it has to be towed onto completely flat ground otherwise gaps appear underneath. 3. Food and water (by bowser) have to be taken out to the middle of a field seperated to the other colony.
So, my experience with it, in case anyone has seen it and wants to get one made up, is that it's a lot of work for 20 or so chickens. If it were static and used as a confined pen near the amenities of the main colony, with roofing and side weather protection, it would serve a better purpose.