Hi there. We want to attach our bunnies hutch/run to our cat flap so they can come and go as they please. The cat flap is in our door and the yard is stone. We're trying to find a way to attach some kind of tunnel without it impeding too much on us opening the door. We're also struggling to come up with ways to securely attach it to a stone yard. It also needs to be secure-we had a stoat visit the bunnies the other day and whilst they were safely tucked away, it's really scared us! Anyone had any experience of a similar problem?