Very creative on your part! I love the way it works. I had to smile when I saw the video!
The trap measures 27 x 32 x 81 cm (10.6 x 12.6 x 31.9 in), so I'd say it is just the size of cat and a small pan for the food bait.Just a thought, you said the cat has only once gone into the trap. Are you able to put a smaller box inside the trap with something nice inside, a blanket, toy, nice food. It would make the trap less obvious, more like a warm place to rest. I dont know if the trap is big enough but as I said, just a thought.