I keep rethinking the idea of my duck tractor. Right now, I've got an A-frame design in my head with a 6 foot by 4 foot enclosed run and a 4 foot by 4 foot house. However, I'm worried about that not being enough room for my three welsh harlequins. The whole unit will be designed to be moved every day or two, and they will get opportunities to run in the yard, it isn't like this is going to be their only space. But, we have a dog who would get bored and eat them if we weren't around. So, my question: Is 24 square feet enough of a run? Also, with the sloping sides of the A-frame style, will it be enough room?