I've used wire cube shelves to make cages where I have kept kittens. I like them because you can pull them apart and use them for other things and the cages are cheaper and larger than a kennel. I am going to try and catch a small feral mother and her kittens. The problem I have with using the cubes is making the door strong. With kittens I just used binder clips to hold the door closed. That worked fine because kittens aren't that strong. But with a feral cat I need something stronger. I hold the cage together with zip ties, but for the door I don't want to have to keep cutting zip ties to open and close it. Any idea's for the door?
How to build your own catio from Cat and Caboodle
How to build your own catio from Cat and Caboodle