So please allow me to update everyone! After looking at all the designs and plans to build a coop, and pricing wood, I made the decision to buy a coop instead. We found a great website that ships all over Europe.....
https://en.joypet.eu/
We choose a coop without a run and then we built a run and sat the coop on top of it. Then we bought a poultry net and enclosed about 20 meters of our garden (yard).
After setting everything up, buying feed, bedding and the small items, we started looking for a breeder. Luck would have it, we found one only 25km away! The big day arrives for us to go and look at (inspect) the girls. All three kids piled into the car and away we were! Each one saying what they wanted....for my youngest (6), she wanted a white one!
After looking over the 5 flocks, each of the monsters, I mean kids, made their choice. My oldest son (16) went with an Amrock, my oldest daughter (12) with a White Sussex and the youngest opted for an Leghorn, because it was all white.
We have had them for a week now and they are well adjusted. My biggest thrill so far is watching my girls get up 30 minutes earlier and prepare the feeder and exchange the water, without being told to! Then in the evening, they go to the coop and tell the girls "good night". Had I know this, I would have gotten the hens about 5 years ago!

Now to just get them ready for another +36 Celsius day!