That is where my Dad comes into it. Wonderful Dad came across the other weekend and built me a cat enclosure. It is 6 meters long and 2 meters high and 1 1/2 meters wide. It has a covered in area where they are protected from the weather and he built it so that it is in shade most of the day.
My 2 girls absolutely love it. I put them in it all day while I'm at work if the weather isn't too hot. Otherwise I put them in it for a few hours at night when I get home. They think it is fantastic. I can't get Mille, the small grey one to even get out of it some nights.