I have one....the chickens hate it, the cat loves it. But sure, I'm open to ideas.
Serious. DH built a very nice aluminum / wire tractor for me. Getting the chickens into it was an all out wrestling match, getting them back in to the main run almost as bad as getting them in, once out they didn't want in and once in they didn't want out. I had to climb into it more than once to chase chickens out of the tractor. We finally wound up using it as an outside pen for our house cats. They too developed once in, we don't want out attitude. Very frustrating.
It's sitting out in the back yard now. Not quite sure what to do with it, maybe try try again.