Here is my hutch I built, four separate spaces. It's 8ft by 3ft also added fold up tarp to both sides so when it's windy I can block it off. Also did automatic water system since the photo. About to extend the roof and add 2 large dog cages as my grow out pens.
The far end post are 2 foot in the ground and the other end is screwed into the walnut tree. I figured the walnut tree provides tons of shade there in the summer.