Hi,
One slight drawback - whilst the pigs may not be able to get into the chicken house, the chickens will certainly get into the pig pen - I've lost more than a couple after they have gone to sleep and been squashed by a rolling pig. My chucks are free range and often join the pigs at meal times or simply perch on top of them to sunbathe; I often find eggs in the pig pens and my wife and I watched one peck a sleeping pig on the foot until it made room for her to nest between its legs - not the brightest of God's creatures but the farm wouldn't be the same without them.
Regards, Farmer