(I wish you had a door out your third floor to the mesa and then a fun cliff ladder you climb up and down. Maybe the Devs/Giants will give you that, too?)
As far as I know, it just works. All I did was set it up with one pig, let him live up there for a few hours and then check the levels of the feeder and collector. When it worked, I put the other two pigs up there. That's why I said, "For now." I'm concerned that this may eventually be seen as a bug. I sure hope not, though. It's a good option for those who want a protected heard of pigs.
How do you put them in there? I read they 'fixed' it so you can't anymore but the post I was reading was 8 months old. This is 5 months, so I am still holding out some hope!
AbleMable, all you have to do is drag things up there with your mouse in decorate mode. Start with a piglet. Then, once the piglet is up there, you have to feed it. To do that, you have to get close enough, so you have to levitate up to the ceiling and then select the piglet, and click on "feed".
You don't even need to levitate. Just have a shelf or two such that you can stand near the ceiling that is the attic floor. Everything else can be done with clicking.