Tractor Supply, a hardware store sells dog kennels and dog kennel kits. A dog kennel with roof/top would work with cats.

Foster and Smith is a catalog vendor. They sell cat enclosures, maybe seeing what they sell would give you some ideas.

Additionally, an aviary would work as a cat enclosure. Do you know how to frame?

I googled DIY Cat Enclosure Plans, lots of websites.

So, I wonder, are you lazy?

Yes jim, just randomly picking sites off google beats personal recomendations from people who actual have found a good site with buildable plans any day. I googled too and found the same thing...now tell me how do i know which ones have good, well documented, buildable plans.

The phone book if full of the names of roofers, which one do you pick, do you assume all roofers are the same in quality? No you ask people you that have gotten new roofs for recomendations. I am in a pet forum, i assume someone here might know which of the multitude of places on google have good plans.

its like food...i can ask if anyone has a good recipe for cobbler and get a couple that people found tasty to try or i could just randomly choose one i find online and try as a unknown and untested recipe. I'll go with the personally recommended ones over the untested ones found on some random site.

A neighbor at the cabin built a cat house for his cat. He used panels from Tractor Supply. He built a cage that is ~8w x 6l x 6h, the cage has a 3’ Gate and a ceiling. It cost them ~$500. There are dogs, raccoons, and coyotes in the area. They felt they wanted to protect their cats while they were outside.

I answered your post because I don’t think anyone else will.

Maybe you can ask specific questions about the free plans you are interested in.